[7.x] Allow calling invokable classes using FQN

[ryangjchandler]

The container call method currently supports passing in an object and invoking it, but it does not support something more convenient like calling an invokable class by passing in the FQN.

Before:

$action = app()->make(Action::class);
$result = app()->call($action);

After:

$result = app()->call(Action::class);

This is more a quality of life change, especially in instances such as above where you need to resolve some dependencies for the class.

[GrahamCampbell]

Surely the problem is that callBoundMethod doesn't take a callable properly. We shouldn't need to hack this special case in here?

[ryangjchandler]

Surely the problem is that callBoundMethod doesn't take a callable properly. We shouldn't need to hack this special case in here?

I don't see how it would be callBoundMethod's responsibility to do this?

[GrahamCampbell]

Because callback is just some callable?

[GrahamCampbell]

Oh, I see your PR is actually calling callClass.

[ryangjchandler]

Oh, I see your PR is actually calling callClass.

No worries - if you've got any pointers, please tell me. I'm not too familiar with the ins-and-outs of the container so all help is good help 🤙