Migrate Parlour extensions to Tapioca compilers

[dduugg]

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• Removes parlour dependency and associated code, consolidating around tapioca as the One True RBI Generation Tool.
• Resolves https://github.com/Homebrew/brew/blob/7117233/docs/Typechecking.md?plain=1#L47
• Time to run brew typecheck --update is reduced from ~8s to ~3s (2021 M1 MBP).
• Net removal of ~2,500 LoC

[MikeMcQuaid]

Great work here @dduugg!