Summary:
Pull Request resolved: https://github.com/react/react-native/pull/58463
Add `yarn format-swift` and `yarn format-check-swift` using Apple swift-format, and compose them into the repository-wide commands. The wrapper selects a repository-provided formatter when available or uses swift-format 6.3 or newer from the Swift toolchain. Missing tools produce environment-specific setup guidance before Swift is skipped.
Changelog: [Internal]
Reviewed By: cipolleschi
Differential Revision: D119487615
fbshipit-source-id: 4da9939aa7ddf400e810cd17aeec12aa6118023b