[js][ios][android][auth] applyActionCode implemented

lib/modules/auth/index.js

@@ -165,6 +165,21 @@ export default class Auth extends Base {
     return FirebaseAuth.confirmPasswordReset(code, newPassword);
   }
 
+  /**
+   * Applies a verification code sent to the user by email or other out-of-band mechanism.
+   *
+   * @link https://firebase.google.com/docs/reference/js/firebase.auth.Auth#applyActionCode
+   * @param code
+   * @return {Promise.<Null>}
+   */
+  applyActionCode(code: string): Promise<Null> {
+    return FirebaseAuth.applyActionCode(code);
+  }
+
+
+  // TODO: https://firebase.google.com/docs/reference/js/firebase.auth.Auth#applyActionCode
+  // TODO: applyActionCode
+  // TODO: checkActionCode
 
   /**
    * Get the currently signed in user