starlark: Export the RecordTypeMatcher for users in the public API

[PhilipMetzger]

This fixes facebook/starlark-rust#120. Since it allows users now to compare records from different files.

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[meta-codesync]

@facebook-github-bot has imported this pull request. If you are a Meta employee, you can view this in D99510872. (Because this pull request was imported automatically, there will not be any future comments.)

[PhilipMetzger]

cc @ndmitchell for some visibility. I also am writing a patch for facebook/starlark-rust#144 so it'd be nice if these could also be included in the new starlark-rs release.

[ndmitchell]

Review automatically exported from Phabricator review in Meta.

[ndmitchell]

This has CI failures because other pieces are still private.

[PhilipMetzger]

This has CI failures because other pieces are still private.

Should be fixed now.