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This creates a new package, `ghc-boot-th`, to contain the `Extension` type, which now lives in `GHC.LanguageExtension.Type`. This ensures that the transitive dependency set of the `template-haskell` package remains minimal. The `GHC.LanguageExtensions.Type` module is also re-exported by `ghc-boot`, which provides an orphan `binary` instance as well. Test Plan: Validate Reviewers: goldfire, thomie, hvr, austin Reviewed By: thomie Subscribers: RyanGlScott, thomie, erikd, ezyang Differential Revision: https://phabricator.haskell.org/D2224
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