Export functions public types

Author: hsubox76

common/api-review/functions-exp.api.md

@@ -19,6 +19,8 @@ export function httpsCallable(functionsInstance: Functions, name: string, option
 export function useFunctionsEmulator(functionsInstance: Functions, host: string, port: number): void;
 
 
+export * from "@firebase/functions-types-exp";
+
 // (No @packageDocumentation comment for this package)
 
 ```

packages-exp/functions-exp/src/api.ts

@@ -32,6 +32,8 @@ import {
   httpsCallable as _httpsCallable
 } from './service';
 
+export * from '@firebase/functions-types-exp';
+
 /**
  * Returns a Functions instance for the given app.
  * @param app - The FirebaseApp to use.