Merge pull request #20 from onlime/laravel-v12

Laravel 12 Support

Add Laravel 10 support

* Adds `SerializingCacheKeyProvider`, allowing instances of jobs to b…

…e debounced based on their serialized value.

* Adds `ClosureCacheKeyProvider` and `ClosureUniqueIdentifier` provider to allow key behaviour to be easily overridden with closures.

Add support for Laravel 8.x