Attempt automatic JVM detection on startup

[rgrunber]

• Update target platform to I20230615-1800

See eclipse-jdt/eclipse.jdt.debug#230

When the following command request is made :

{
  message: "[Trace - 11:25:11] Sending request 'workspace/executeCommand - (9)'.",
  level: 'info',
  timestamp: '2023-06-27 11:25:11.077'
}
{
  message: 'Params: {\n' +
    '    "command": "java.project.getSettings",\n' +
    '    "arguments": [\n' +
    '        "file:///home/rgrunber/sample-projects/null-analysis-app/",\n' +
    '        [\n' +
    '            "org.eclipse.jdt.core.compiler.source",\n' +
    '            "org.eclipse.jdt.ls.core.vm.location"\n' +
    '        ]\n' +
    '    ]\n' +
    '}\n' +
    '\n',
  level: 'info',
  timestamp: '2023-06-27 11:25:11.077'
}

The response for "org.eclipse.jdt.ls.core.vm.location" is something like :
"/usr/lib/jvm/java-11-openjdk-11.0.19.0.7-1.fc37.x86_64"
instead of :
"/usr/lib/jvm/java-17-openjdk-17.0.7.0.7-5.fc37.x86_64".

This assumes a JVM from the system can be detected and that "org.eclipse.jdt.core.compiler.source": "11" is detected from the build configuration.