Support gh extension

[babarot]

WHAT

Support gh extension

• https://github.com/cli/cli
• https://docs.github.com/en/github-cli/github-cli/using-github-cli-extensions
• https://github.blog/2023-01-13-new-github-cli-extension-tools/

WHY

Officially gh command has a sub command to install its extenstions: gh extension install owern/repo command (guide). But it's difficult to manage what we downloaded as code. In afx, by handling them as the same as other packages, it allows us to codenize them.

[github-actions[bot]]

This PR will update b4b4r07/afx from v0.1.26 to v0.2.0 :rocket:

Changes: https://github.com/b4b4r07/afx/compare/v0.1.26...babarot/gh-extension

If this update isn't as you expected, you may want to change or remove the release label.

[github-actions[bot]]

The new version v0.2.0 has been released :tada:

Changes: https://github.com/b4b4r07/afx/compare/v0.1.26...v0.2.0