Support Query Scope classes

[caugner]

Is your feature request related to a problem? Please describe.

Query Scope classes can be created using make:scope as an alternative to creating "local" scopes inside the Model class directly. The Scope interface has an apply() method that takes two parameters, Builder $builder and Model $model and these can not be overwritten in a Scope implementation, as this causes Psalm to emit a MoreSpecifciImplementedParamType error.

Describe the solution you'd like
The Scope interface should be extended with a @template TModel of Model, so that the apply() parameters can be typed as @param Builder<TModel> $builder and @param TModel $model respectively.

Describe alternatives you've considered
(None.)

Additional context

• Illuminate/Database/Eloquent/Scope @ 8.x
• Illuminate/Database/Eloquent/Scope @ 6.x
• Illuminate/Database/Eloquent/Scope @ master/9.x