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
This PR forks a new version of the `zed_extension_api` in preparation
for some upcoming changes that require breaking changes to the WIT.
Release Notes:
- N/A
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Co-authored-by: Max <max@zed.dev>