Add task to generate JSON schema for .infrahub.yml files

[ogenstad]

Adds an invoke task to generate the JSON schema file for .infrahub.yml files, these are the schema files that then gets added to the https://github.com/opsmill/infrahub-jsonschema repo for inclusion in the language server for Yaml.

Currently this task already exists within Infrahub. However that is just something that's remained since before the SDK moved to a git submodule. Creating this command here instead so it's easier to generate the file within its own context.

Summary by CodeRabbit

• Chores
  • Added development utility for generating repository configuration schema documentation.

_{✏️ Tip: You can customize this high-level summary in your review settings.}

[coderabbitai]

Walkthrough

This change introduces runtime JSON schema generation as a new Invoke task. The modification adds the json module import and a new task function that generates a JSON schema from the repository configuration model. When executed, this task creates the necessary output directory structure and writes the generated schema to a file with proper formatting. The implementation follows the established pattern of existing tasks within the file, integrating with the build infrastructure for schema documentation purposes.

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: adding a new task to generate JSON schema for .infrahub.yml files, which is the primary purpose of this pull request.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

@@           Coverage Diff           @@
##           stable     #788   +/-   ##
=======================================
  Coverage   80.36%   80.36%           
=======================================
  Files         115      115           
  Lines        9865     9865           
  Branches     1504     1504           
=======================================
  Hits         7928     7928           
  Misses       1415     1415           
  Partials      522      522           

Flag	Coverage Δ
integration-tests	41.41% <ø> (ø)
python-3.10	51.36% <ø> (-0.03%)	⬇️
python-3.11	51.38% <ø> (+0.02%)	⬆️
python-3.12	51.38% <ø> (+0.02%)	⬆️
python-3.13	51.36% <ø> (ø)
python-3.14	53.01% <ø> (-0.03%)	⬇️
python-filler-3.12	24.07% <ø> (ø)

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