feat: add sphinx-jsonschema extension for JSON Schema rendering

[a-zw]

See it in action: https://eclipse-score.github.io/docs-as-code/pr-553/reference/metamodel.html

Closes #472

[github-actions]

License Check Results

🚀 The license check job ran with the Bazel command:

bazel run --lockfile_mode=error //src:license-check

Status: ⚠️ Needs Review

Click to expand output

[License Check Output]
Extracting Bazel installation...
Starting local Bazel server (8.6.0) and connecting to it...
INFO: Invocation ID: 2c03493e-ed36-4ef0-a6de-728a7cc79c20
Computing main repo mapping: 
Loading: 
Loading: 0 packages loaded
Loading: 0 packages loaded
Loading: 0 packages loaded
    currently loading: src
WARNING: Target pattern parsing failed.
ERROR: Skipping '//src:license-check': no such target '//src:license-check': target 'license-check' not declared in package 'src' defined by /home/runner/work/docs-as-code/docs-as-code/src/BUILD
ERROR: no such target '//src:license-check': target 'license-check' not declared in package 'src' defined by /home/runner/work/docs-as-code/docs-as-code/src/BUILD
INFO: Elapsed time: 6.204s
INFO: 0 processes.
ERROR: Build did NOT complete successfully
ERROR: Build failed. Not running target

[github-actions]

The created documentation from the pull request is available at: docu-html

[a-zw]

Checks report:

• Fixed missing header in: docs/reference/metamodel.rst
• ERROR: /home/runner/work/docs-as-code/docs-as-code/BUILD:19:5: Sphinx building needs for //:needs_json failed: (Exit 1): sphinx_build failed: error executing SphinxBuildDocs command (from target //:needs_json) bazel-out/k8-opt-exec-ST-d57f47055a04/bin/sphinx_build @bazel-out/k8-fastbuild/bin/needs_json/_build/needs-0.params

Locally tests and linting passes cleanly. 🤷

[github-actions]

Thanks for the pull request. This thread has been quiet for 30 days, so we are marking it as stale for now. Please take a quick look and let us know whether it is still up to date, still relevant, needs review, or is ready to merge. Any new activity will remove the stale label automatically. If nothing changes in the next 10 days, we will close it to keep the backlog current.

[a-zw]

I am concerned that the repository has been marked archived which increases the risk that it may add risk to the build. Please take care with the use of this extension, @maximiliansoerenpollakI am concerned that the repository has been marked archived which increases the risk that it may add risk to the build. Please take care with the use of this extension, @MaximilianSoerenPollak

From https://gitlab.eclipse.org/eclipsefdn/helpdesk/-/work_items/7578#note_7531378

[a-zw]

Build fails because of

.. jsonschema:: ../../src/extensions/score_metamodel/metamodel-schema.json

One more case of waiting for eclipse-score/score#2826