feat(librarian): add ability to create and fetch a gist

[chingor13]

Towards #2543

[gemini-code-assist]

Summary of Changes

Hello @chingor13, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the application's integration with GitHub by introducing the capability to create and fetch Gists. This allows for dynamic interaction with GitHub's Gist service, enabling the storage and retrieval of code snippets or other text-based content. The changes include new client methods and a corresponding system test to ensure proper functionality.

Highlights

• GitHub Gist Integration: New functions have been added to the GitHub client to enable the creation and retrieval of GitHub Gists, facilitating external code sharing and storage.
• Gist Creation: A CreateGist method is introduced, allowing users to programmatically create new public or private gists with specified file contents.
• Gist Content Retrieval: A GetGistContent method is now available to fetch all file contents from a given Gist ID, providing access to previously stored code snippets.
• System Test Coverage: An integration test, TestCreateGist, has been added to verify the end-to-end functionality of creating a gist and then successfully retrieving its content.

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[gemini-code-assist]

Code Review

This pull request introduces the capability to create and retrieve GitHub gists, which is a useful addition. The implementation in internal/github/github.go is clean and follows the existing patterns. The accompanying system test in system_test.go effectively validates the new functionality. My review includes a couple of suggestions to improve the test's robustness and cleanliness: specifically, to use a private gist instead of a public one to avoid exposing it, and to add a cleanup step to delete the gist after the test completes, preventing resource leakage in the testing environment.

[codecov]

Codecov Report

❌ Patch coverage is 53.12500% with 30 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.46%. Comparing base (739ce0d) to head (389a49b).

Files with missing lines	Patch %	Lines
internal/github/github.go	0.00%	30 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2617      +/-   ##
==========================================
- Coverage   85.65%   85.46%   -0.19%     
==========================================
  Files         108      109       +1     
  Lines       10985    11049      +64     
==========================================
+ Hits         9409     9443      +34     
- Misses       1244     1274      +30     
  Partials      332      332              

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