Callable functions

[janpansa]

Describe the feature you would like to see

I would like to use callable functions (Firebase cloud functions).

Something like this:

$functions = Firebase::functions();
$functions->getHttpsCallable('someCallableFunction')->call(
             [
                 'some' => $data,
                 'more' => $values
             ]
         );

I don't see that this is possible right now with this package.