getUser method
Gets the user data for the user corresponding to a given uid.
See https://firebase.google.com/docs/auth/admin/manage-users#retrieve_user_data for code samples and detailed documentation.
Returns a Future fulfilled with the use data corresponding to the provided uid.
Implementation
Future<UserRecord> getUser(String uid) async {
final response = await _authRequestHandler.getAccountInfoByUid(uid);
// Returns the user record populated with server response.
return UserRecord.fromResponse(response);
}