Invalidate model cache in code.

[mikebronner]

One aspect that can be improved in this package would be a way of invalidating the cache directly from the code using a Facade after a mass assignment/update instead of having to rely on an Artisan call like:

Artisan::call('modelCache:clear', ['--model' => 'App\Model']);

Originally posted by @daika7ana in #479

[mikebronner]

@daika7ana thanks for this suggestion, great idea.