Expose repos as github resource in 3008.3+

[lkubb]

What does this PR do?

Adds a github resource connection module with overlay modules/state that allow targeting repositories as individual resources.

Merge requirements satisfied?

[NOTICE] Bug fixes or new features require tests.

• Docs
• Changelog - https://salt-extensions.github.io/salt-extension-copier/topics/documenting/changelog.html#procedure
• Tests written/updated

Commits signed with GPG?

Yes

[codecov]

Codecov Report

❌ Patch coverage is 86.57188% with 85 lines in your changes missing coverage. Please review.
✅ Project coverage is 97.29%. Comparing base (1dfcc1f) to head (e8005d8).

Files with missing lines	Patch %	Lines
tests/functional/resources/conftest.py	18.00%	39 Missing and 2 partials ⚠️
src/saltext/github/utils/gh/profile.py	62.50%	28 Missing and 2 partials ⚠️
src/saltext/github/states/github_repo.py	87.50%	6 Missing ⚠️
src/saltext/github/utils/gh/statecores/repo.py	95.50%	2 Missing and 2 partials ⚠️
...saltext/github/utils/gh/statecores/environments.py	97.43%	2 Missing ⚠️
src/saltext/github/utils/gh/statecores/pages.py	96.66%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #33      +/-   ##
==========================================
- Coverage   98.11%   97.29%   -0.82%     
==========================================
  Files          97      106       +9     
  Lines        6941     7093     +152     
  Branches      494      513      +19     
==========================================
+ Hits         6810     6901      +91     
- Misses        101      156      +55     
- Partials       30       36       +6     

Flag	Coverage Δ
Linux	97.29% <86.57%> (-0.82%)	⬇️
macOS	97.29% <86.57%> (-0.82%)	⬇️
project	97.00% <92.42%> (-0.63%)	⬇️
py310	90.20% <86.57%> (-0.67%)	⬇️
py311	90.20% <86.57%> (-0.67%)	⬇️
py314	97.26% <86.57%> (-0.83%)	⬇️
salt_3006_27	90.20% <86.57%> (-0.67%)	⬇️
salt_3008_2	97.26% <86.57%> (-0.83%)	⬇️
tests	97.44% <21.15%> (-0.92%)	⬇️

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