Add testable documentation examples to featuregate package

[parv18050212]

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This PR adds clear, testable documentation examples to the featuregate package. The examples demonstrate:

• How to create a feature gate and print its properties.

• How to register a feature gate in a custom registry, set its value, and visit all registered gates.

• Updated doc.go with concise usage examples in Go doc comment format.

• Added example_test.go with runnable Go example functions, ensuring the documentation is both visible on pkg.go.dev and verified by go test.

These examples help new users understand how to use the featuregate API and ensure the documentation remains correct and up to date.!

[linux-foundation-easycla[bot]]

The committers listed above are authorized under a signed CLA.

• :white_check_mark: login: parv18050212 / name: Parv Agarwal (d87ca40e7a7bf6cec93b254f2e08353b720cbc05, af3846d12dd83ebc80dd2e4313677fd290376fd6, f2f5acfd1cb3fbc6be385d77e6554335d6d6f21a, b6453e7fc152bbff70036e9fc6b8e9d1aad36f5f, 2ce60ea356cd9b8ff7fe336a50ee8c1d5d533d67, 626bf0641be463ff40b076d77c8e4d43aeebd9de, e38e58272a6a9d57b7603c86a94367d38ee704cb, 8e62aee3f2fbfde20e16f1d54f5468532d14da7c, c7869df33773dc5efff5cf5dfd979033edd9c215, 99996ce30e342009b0a2ad1e243e957ae9f0eb4f)

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 91.58%. Comparing base (6aa2b81) to head (626bf06). Report is 62 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #13159      +/-   ##
==========================================
- Coverage   91.59%   91.58%   -0.02%     
==========================================
  Files         522      522              
  Lines       29145    29145              
==========================================
- Hits        26695    26691       -4     
- Misses       1933     1936       +3     
- Partials      517      518       +1     

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[github-actions[bot]]

This PR was marked stale due to lack of activity. It will be closed in 14 days.

[dmathieu]

Could you fix the CI issues?

[parv18050212]

sure i am working on that

[parv18050212]

@dmathieu Hi, I’ve fixed all the CI-related issues The latest commit is pushed, and CI checks are currently pending. Just wanted to update you on the progress. Will monitor and make any changes if needed. Thanks!

[parv18050212]

@dmathieu workflows awaiting approval from the maintainers kindly approve the workflow

[github-actions[bot]]

This PR was marked stale due to lack of activity. It will be closed in 14 days.