zed_extension_api: Add `github_release_by_tag_name` (#12172)

This PR adds a new `github_release_by_tag_name` method to the
`zed_extension_api` to allow for retrieving a GitHub release by its tag
name.

Release Notes:

- N/A
054c36cc29Marshall Bowers committed on 5/23/2024, 12:40:31 AM· committed by GitHubparent85ff80f
4 files changedLine totals unavailable