Guess models of JSON resources from a parameter passed to the resource's $resource property

[romalytvynenko]

Maybe easier to implement after #132

Right now, to get proper types in JsonResource, Scramble will either check App\Models\* ns, or will require user to manually specify a type of a model this resource represents.

This is fine, but feels like it would be a nice DX improvement if Scramble automatically guessed a model for resource based on a type of parameter passed to the resource. If this guessing is not correct, users can always opt-out and specify model manually.