feat: Extract notice docs from source-code for in-app use and schema export

[bdferris-v2]

Summary:

Per discussion in #1324, this PR adds support for extracting documentation from notice source code, to be included as JSON resources bundles in the compiled application. These will be included in the now-expanded JSON schema export feature, including comments, reference links, and hopefully enough info to generate RULES.md from source.

See https://bit.ly/gtfs-validator-notice-documentation for initial design discussion.

• Run the unit tests with gradle test to make sure you didn't break anything
• Format the title like "feat: [new feature short description]". Title must follow the Conventional Commit Specification(https://www.conventionalcommits.org/en/v1.0.0/).
• Linked all relevant issues
• Include screenshot(s) showing how this pull request works and fixes the issue(s)

[github-actions]

✅ Rule acceptance tests passed.
New Errors: 0 out of 1423 datasets (~0%) are invalid due to code change, which is less than the provided threshold of 1%.
Dropped Errors: 0 out of 1423 datasets (~0%) are invalid due to code change, which is less than the provided threshold of 1%.
New Warnings: 0 out of 1423 datasets (~0%) are invalid due to code change, which is less than the provided threshold of 1%.
Dropped Warnings: 0 out of 1423 datasets (~0%) are invalid due to code change, which is less than the provided threshold of 1%.
0 out of 1423 sources (~0 %) are corrupted.
Commit: 1a4e969
Download the full acceptance test report here (report will disappear after 90 days).
✅ Rule acceptance tests passed.

[davidgamez]

@bdferris-v2 let's connect to discuss where the generated documentation can live to make it easily accessible to consumers.

[davidgamez]

LGTM! 💪

[github-actions]

✅ Rule acceptance tests passed.
New Errors: 0 out of 1424 datasets (~0%) are invalid due to code change, which is less than the provided threshold of 1%.
Dropped Errors: 0 out of 1424 datasets (~0%) are invalid due to code change, which is less than the provided threshold of 1%.
New Warnings: 0 out of 1424 datasets (~0%) are invalid due to code change, which is less than the provided threshold of 1%.
Dropped Warnings: 0 out of 1424 datasets (~0%) are invalid due to code change, which is less than the provided threshold of 1%.
0 out of 1424 sources (~0 %) are corrupted.
Commit: 941a933
Download the full acceptance test report here (report will disappear after 90 days).
✅ Rule acceptance tests passed.

[github-actions]

✅ Rule acceptance tests passed.
New Errors: 0 out of 1425 datasets (~0%) are invalid due to code change, which is less than the provided threshold of 1%.
Dropped Errors: 0 out of 1425 datasets (~0%) are invalid due to code change, which is less than the provided threshold of 1%.
New Warnings: 0 out of 1425 datasets (~0%) are invalid due to code change, which is less than the provided threshold of 1%.
Dropped Warnings: 0 out of 1425 datasets (~0%) are invalid due to code change, which is less than the provided threshold of 1%.
0 out of 1425 sources (~0 %) are corrupted.
Commit: 548b7bd
Download the full acceptance test report here (report will disappear after 90 days).
✅ Rule acceptance tests passed.