Added TypeScript definitions for firebase.functions() (#724)
Added TypeScript definitions for firebase.functions() (#724)

* added typing for functions

* [AUTOMATED]: Prettier Code Styling

* renamed firebase.functions.FirebaseFunctions to firebase.functions.Functions, moved Firestore/FunctionsErrorCodes to ErrorStatus in their namespaces.

* returned back to FirestoreErrorCode as ErrorStatus in the firestore namespace for now.

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