Add Id::for(string-class): callable(string): Id shortcut

[Baptouuuu]

When wrapping a string id from outside of the app (user input or external service) to an Id the method Id::of(MyAggregate::class, $id) is used and it's enough.

However when wrapping a Set/Sequence of ids then the call has to be made inside a map resulting in the notation $set->map(static fn(string $id) => Id::of(MyAggregate::class, $id)) which is a bit verbose.

By introducing the method Id::for(string-class): (callable(string): Id) the map can be written as $set->map(Id::of(MyAggregate::class)).