[1.x] Allow retrieving all features for a scope when some features are defined for differing scopes

[cosmastech]

This should resolve #112

We are building a feature flags endpoint for our mobile and web consumers. We need to be able to get all features for 3-4 scopes which are related to the user, but not the user object itself.

I ran into this exact issue earlier today. I saw that this issue had been open for a few weeks without a PR so I figured I'd take a stab at it.

---

Given we have features defined for different scopes

Feature::define('feature-for-user', fn(User $u) => true);
Feature::define('feature-for-team', fn(Team $t) => true);

When we attempt to load all features for a particular scope

$features = Feature::for($user)->all()

Then we expect to receive feature flag definitions ONLY for that apply to Users.

dd($features);
/*
array:1 [
  "feature-for-user" => true
]
*/

Currently, however, an exception is thrown: TypeError: Tests\Feature\DatabaseDriverTest::Tests\Feature{closure}(): Argument #1 ($t) must be of type Workbench\App\Models\Team, Workbench\App\Models\User given, called in /Users/luke/Projects/laravel-pennant/src/Drivers/Decorator.php on line 173

Non-goals of this PR

One outstanding question is: do we expect to allow for union or intersection types in the resolving function? Like Feature::define('team-or-user-feature', fn(Team|User $v) => true); Seems like this probably wouldn't work with how scopes are set up in general. I am sure that my change will not work in this case.

Also, you can still call Feature::for($user)->activate('team-scoped-feature'); I believe that ideally there would be a guard for this, but it seems like it's beyond the scope of this PR.

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[taylorotwell]

Drafting pending review from @timacdonald