feat: autodoc error on misplaced @Setting annotations

[ndr-brt]

What this PR changes/adds

Make autodoc fail on misplaced @Setting annotations.

Why it does that

Improve autodoc output.

Further notes

List other areas of code that have changed but are not necessarily linked to the main feature. This could be method
signature changes, package declarations, bugs that were encountered and were fixed inline, etc.

Linked Issue(s)

Closes #227

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[github-actions]

Test Results

48 tests   - 8   48 ✅  - 8   16s ⏱️ -1s
20 suites +2    0 💤 ±0 
20 files   +2    0 ❌ ±0 

Results for commit b092334. ± Comparison against base commit 5138526.

This pull request removes 22 and adds 14 tests. Note that renamed tests count towards both.

org.eclipse.edc.plugins.autodoc.core.processor.EdcModuleProcessorExtensionTest ‑ [1] -Aedc.version=1.2.3, -Aedc.id=, -Aedc.outputDir=some/dir
org.eclipse.edc.plugins.autodoc.core.processor.EdcModuleProcessorExtensionTest ‑ [1] -Aedc.version=1.2.3, -Aedc.id=someid, -Aedc.outputDir=build/some/dir
org.eclipse.edc.plugins.autodoc.core.processor.EdcModuleProcessorExtensionTest ‑ [2] -Aedc.version=1.2.3, -Aedc.id=someid, null
org.eclipse.edc.plugins.autodoc.core.processor.EdcModuleProcessorExtensionTest ‑ [2] -Aedc.version=1.2.3, null, -Aedc.outputDir=some/dir
org.eclipse.edc.plugins.autodoc.core.processor.EdcModuleProcessorExtensionTest ‑ [3] -Aedc.version=, -Aedc.id=someid, -Aedc.outputDir=some/dir
org.eclipse.edc.plugins.autodoc.core.processor.EdcModuleProcessorExtensionTest ‑ [3] -Aedc.version=1.2.3, -Aedc.id=someid, -Aedc.outputDir=
org.eclipse.edc.plugins.autodoc.core.processor.EdcModuleProcessorExtensionTest ‑ [4] null, -Aedc.id=someid, -Aedc.outputDir=some/dir
org.eclipse.edc.plugins.autodoc.core.processor.EdcModuleProcessorExtensionTest ‑ verifyManifestContainsCorrectElements()
org.eclipse.edc.plugins.autodoc.core.processor.EdcModuleProcessorExtensionTest ‑ verifyManifestContainsCorrectSettingsWithContext()
org.eclipse.edc.plugins.autodoc.core.processor.EdcModuleProcessorExtensionTest ‑ verifyManifestContainsExtension()
…

org.eclipse.edc.plugins.autodoc.core.processor.EdcModuleProcessorTest ‑ shouldFail_whenSettingIsDefinedInClassNotExtension()
org.eclipse.edc.plugins.autodoc.core.processor.EdcModuleProcessorTest$CompilerArgs ‑ [1] -Aedc.version=1.2.3, -Aedc.id=, -Aedc.outputDir=some/dir
org.eclipse.edc.plugins.autodoc.core.processor.EdcModuleProcessorTest$CompilerArgs ‑ [1] -Aedc.version=1.2.3, -Aedc.id=someid, -Aedc.outputDir=build/some/dir
org.eclipse.edc.plugins.autodoc.core.processor.EdcModuleProcessorTest$CompilerArgs ‑ [2] -Aedc.version=1.2.3, -Aedc.id=someid, null
org.eclipse.edc.plugins.autodoc.core.processor.EdcModuleProcessorTest$CompilerArgs ‑ [2] -Aedc.version=1.2.3, null, -Aedc.outputDir=some/dir
org.eclipse.edc.plugins.autodoc.core.processor.EdcModuleProcessorTest$CompilerArgs ‑ [3] -Aedc.version=, -Aedc.id=someid, -Aedc.outputDir=some/dir
org.eclipse.edc.plugins.autodoc.core.processor.EdcModuleProcessorTest$CompilerArgs ‑ [3] -Aedc.version=1.2.3, -Aedc.id=someid, -Aedc.outputDir=
org.eclipse.edc.plugins.autodoc.core.processor.EdcModuleProcessorTest$CompilerArgs ‑ [4] null, -Aedc.id=someid, -Aedc.outputDir=some/dir
org.eclipse.edc.plugins.autodoc.core.processor.EdcModuleProcessorTest$CompilerArgs ‑ shouldCreateManifestFile_tempDir()
org.eclipse.edc.plugins.autodoc.core.processor.EdcModuleProcessorTest$CompilerArgs ‑ shouldOverrideOutputFolder()
…

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