feat(build): add/apply autodoc plugin

[paullatzelsperger]

What this PR changes/adds

Applies the autodoc plugin to the EDC code base.

Why it does that

metadata manifests should be auto-generated

Further notes

• At this time we only have a 0.0.1-SNAPSHOT version available
• The plugin, the annotation processor and the metamodel all use the same version, but I created three different variables, because their versioning might deviate in the future.
• the plugin's name and group id looks wrong, but actually needs to be this way, otherwise publishing to OSSRH Snapshots and the Gradle Portal would not be possible
• documentation will follow shortly, once the documentation-PR (docs: add documentation for autodoc GradlePlugins#12) of the plugin itself is merged, because it will link there.

Linked Issue(s)

Checklist

• added appropriate tests?
• performed checkstyle check locally?
• added/updated copyright headers?
• documented public classes/methods?
• added/updated relevant documentation?
• assigned appropriate label? (exclude from changelog with label no-changelog)
• formatted title correctly? (take a look at the CONTRIBUTING and styleguide for details)

[codecov-commenter]

Codecov Report

Base: 63.85% // Head: 63.87% // Increases project coverage by +0.02% 🎉

Coverage data is based on head (ea2576c) compared to base (01f797b).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2028      +/-   ##
==========================================
+ Coverage   63.85%   63.87%   +0.02%     
==========================================
  Files         781      781              
  Lines       16505    16512       +7     
  Branches     1075     1076       +1     
==========================================
+ Hits        10539    10547       +8     
+ Misses       5519     5518       -1     
  Partials      447      447              

Impacted Files	Coverage Δ
...econnector/spi/system/ServiceExtensionContext.java	0.00% <0.00%> (ø)
...ataspaceconnector/boot/system/ExtensionLoader.java	87.17% <0.00%> (+0.33%)	⬆️
...or/boot/system/DefaultServiceExtensionContext.java	88.37% <0.00%> (+1.52%)	⬆️
...taspaceconnector/junit/testfixtures/MockVault.java	28.57% <0.00%> (+28.57%)	⬆️

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[ndr-brt]

neat