[7.x] Added support to use where in apiResource method

[Xfaider48]

This PR adds the possibility to use where option in apiResource method:

Route::apiResource('tests', TestController::class, [
   'where' => [
      'test' => '\d+'
   ]
]);

[taylorotwell]

Do we allow this on normal calls to Route::resource?

[Xfaider48]

Do we allow this on normal calls to Route::resource?

Yes, we do. I just added a wheres method to PendingResourceRegistration to control where option in resource (like other options) and added test for it.