Improve support for validation in setter methods

[remkop]

Currently, if an exception is thrown from an annotated setter method, an ugly stacktrace results.
ArgSpec.set rethrows PicocliException rather than rethrowing it, but when the setter is reflection based, the exception caught is an InvocationTargetException, not the actual exception thrown in the method.

Provide better handling for InvocationTargetException.

(Needed for junit-team/junit5#1498 )

org.junit.platform.commons.JUnitException: Error parsing command-line arguments

	at org.junit.platform.console.options.PicocliCommandLineOptionsParser.parse(PicocliCommandLineOptionsParser.java:41)
	at org.junit.platform.console.options.PicocliCommandLineOptionsParserTests.parseArgLine(PicocliCommandLineOptionsParserTests.java:555)
	at org.junit.platform.console.options.PicocliCommandLineOptionsParserTests.lambda$parseValidConfigurationParameters$143(PicocliCommandLineOptionsParserTests.java:488)
	at org.junit.jupiter.api.AssertAll.lambda$assertAll$1(AssertAll.java:68)
	at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183)
	at java.base/java.util.stream.ReferencePipeline$11$1.accept(ReferencePipeline.java:442)
	at java.base/java.util.Spliterators$ArraySpliterator.forEachRemaining(Spliterators.java:948)
	at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484)
	at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474)
	at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150)
	at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173)
	at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
	at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497)
	at org.junit.jupiter.api.AssertAll.assertAll(AssertAll.java:66)
	at org.junit.jupiter.api.AssertAll.assertAll(AssertAll.java:43)
	at org.junit.jupiter.api.AssertAll.assertAll(AssertAll.java:37)
	at org.junit.jupiter.api.Assertions.assertAll(Assertions.java:1067)
	at org.junit.platform.console.options.PicocliCommandLineOptionsParserTests.parseValidConfigurationParameters(PicocliCommandLineOptionsParserTests.java:479)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:564)
	at org.junit.platform.commons.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:515)
	at org.junit.jupiter.engine.execution.ExecutableInvoker.invoke(ExecutableInvoker.java:115)
	at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.lambda$invokeTestMethod$6(TestMethodTestDescriptor.java:171)
	at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:72)
	at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.invokeTestMethod(TestMethodTestDescriptor.java:167)
	at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:114)
	at org.junit.jupiter.engine.descriptor.TestMethodTestDescriptor.execute(TestMethodTestDescriptor.java:59)
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:131)
	at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:72)
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:127)
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:107)
	at java.base/java.util.ArrayList.forEach(ArrayList.java:1378)
	at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38)
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:136)
	at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:72)
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:127)
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:107)
	at java.base/java.util.ArrayList.forEach(ArrayList.java:1378)
	at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.invokeAll(SameThreadHierarchicalTestExecutorService.java:38)
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.lambda$executeRecursively$5(NodeTestTask.java:136)
	at org.junit.platform.engine.support.hierarchical.ThrowableCollector.execute(ThrowableCollector.java:72)
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.executeRecursively(NodeTestTask.java:127)
	at org.junit.platform.engine.support.hierarchical.NodeTestTask.execute(NodeTestTask.java:107)
	at org.junit.platform.engine.support.hierarchical.SameThreadHierarchicalTestExecutorService.submit(SameThreadHierarchicalTestExecutorService.java:32)
	at org.junit.platform.engine.support.hierarchical.HierarchicalTestExecutor.execute(HierarchicalTestExecutor.java:52)
	at org.junit.platform.engine.support.hierarchical.HierarchicalTestEngine.execute(HierarchicalTestEngine.java:51)
	at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:184)
	at org.junit.platform.launcher.core.DefaultLauncher.lambda$execute$5(DefaultLauncher.java:152)
	at org.junit.platform.launcher.core.DefaultLauncher.withInterceptedStreams(DefaultLauncher.java:166)
	at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:145)
	at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:92)
	at com.intellij.junit5.JUnit5IdeaTestRunner.startRunnerWithArgs(JUnit5IdeaTestRunner.java:74)
	at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
	at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
	at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)
Caused by: picocli.CommandLine$ParameterException: PicocliException: Could not invoke public void org.junit.platform.console.options.AvailableOptions.setConfigurationParameters(java.util.Map) with {foo=bar, baz=qux} while processing argument at or before arg[3] 'baz=qux' in [--config, foo=bar, --config, baz=qux]: picocli.CommandLine$PicocliException: Could not invoke public void org.junit.platform.console.options.AvailableOptions.setConfigurationParameters(java.util.Map) with {foo=bar, baz=qux}
	at picocli.CommandLine$ParameterException.create(CommandLine.java:8754)
	at picocli.CommandLine$ParameterException.access$9700(CommandLine.java:8678)
	at picocli.CommandLine$Interpreter.parse(CommandLine.java:5527)
	at picocli.CommandLine$Interpreter.parse(CommandLine.java:5421)
	at picocli.CommandLine.parseArgs(CommandLine.java:601)
	at org.junit.platform.console.options.PicocliCommandLineOptionsParser.parse(PicocliCommandLineOptionsParser.java:37)
	... 56 more
Caused by: picocli.CommandLine$PicocliException: Could not invoke public void org.junit.platform.console.options.AvailableOptions.setConfigurationParameters(java.util.Map) with {foo=bar, baz=qux}
	at picocli.CommandLine$Model$MethodBinding.set(CommandLine.java:5090)
	at picocli.CommandLine$Model$ArgSpec.setValue(CommandLine.java:4031)
	at picocli.CommandLine$Interpreter.applyValuesToMapField(CommandLine.java:5921)
	at picocli.CommandLine$Interpreter.applyOption(CommandLine.java:5823)
	at picocli.CommandLine$Interpreter.processStandaloneOption(CommandLine.java:5726)
	at picocli.CommandLine$Interpreter.processArguments(CommandLine.java:5639)
	at picocli.CommandLine$Interpreter.parse(CommandLine.java:5521)
	... 59 more
Caused by: java.lang.reflect.InvocationTargetException
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:564)
	at picocli.CommandLine$Model$MethodBinding.set(CommandLine.java:5086)
	... 65 more
Caused by: picocli.CommandLine$PicocliException: Duplicate key 'foo' for values 'bar' and 'bar'.
	at org.junit.platform.console.options.AvailableOptions.setConfigurationParameters(AvailableOptions.java:254)
	... 70 more

[remkop]

After fixing this, the stack trace now looks like the below. This looks better.

org.junit.platform.console.ConsoleLauncher --config foo=bar --config foo=baz
Exception in thread "main" org.junit.platform.commons.JUnitException: Error parsing command-line arguments
	at org.junit.platform.console.options.PicocliCommandLineOptionsParser.parse(PicocliCommandLineOptionsParser.java:38)
	at org.junit.platform.console.ConsoleLauncher.execute(ConsoleLauncher.java:68)
	at org.junit.platform.console.ConsoleLauncher.execute(ConsoleLauncher.java:47)
	at org.junit.platform.console.ConsoleLauncher.main(ConsoleLauncher.java:39)
Caused by: picocli.CommandLine$ParameterException: Duplicate key 'foo' for values 'bar' and 'baz'.
	at org.junit.platform.console.options.AvailableOptions.setConfigurationParameters(AvailableOptions.java:263)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:564)
	at picocli.CommandLine$Model$MethodBinding.set(CommandLine.java:5097)
	at picocli.CommandLine$Model$ArgSpec.setValue(CommandLine.java:4041)
	at picocli.CommandLine$Interpreter.applyValuesToMapField(CommandLine.java:5935)
	at picocli.CommandLine$Interpreter.applyOption(CommandLine.java:5837)
	at picocli.CommandLine$Interpreter.processStandaloneOption(CommandLine.java:5740)
	at picocli.CommandLine$Interpreter.processArguments(CommandLine.java:5653)
	at picocli.CommandLine$Interpreter.parse(CommandLine.java:5535)
	at picocli.CommandLine$Interpreter.parse(CommandLine.java:5435)
	at picocli.CommandLine.parseArgs(CommandLine.java:601)
	at org.junit.platform.console.options.PicocliCommandLineOptionsParser.parse(PicocliCommandLineOptionsParser.java:34)
	... 3 more