register fake driver at service provider

[jleonardolemos]

Description

The fake driver should be registered at ServiceProvider to be extensible and swapable.
This MR juster resolve the fake driver at service container instead of using new statement.
This MR is not a BC

[amazon-q-developer]

Review Summary

This PR successfully refactors the fake driver registration to use Laravel's service container instead of direct instantiation, which improves extensibility and follows Laravel best practices.

Key Changes:

• ✅ Added PigeonFake registration as singleton in PigeonServiceProvider
• ✅ Updated Pigeon::fake() to resolve from container using app('pigeon-fake')
• ✅ Proper import added for PigeonFake class

Action Required:

• Update the provides() method to include 'pigeon-fake' for proper service discovery

The implementation is solid and maintains backward compatibility while improving the architecture. Once the provides() method is updated, this will be ready to merge.

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[amazon-q-developer]

Since you're now registering 'pigeon-fake' as a singleton in this service provider, you should also add it to the provides() method return array. The method currently only returns ['pigeon'] but should return ['pigeon', 'pigeon-fake'] to ensure proper service discovery when the provider is deferred.