Expose registered singletons or lazy singletons

[dannygmr]

I would like to have the following functionality:

To get all services that implement a particular interface, not just factories or named factories.

class A implements Cleanable{
.
.
.
}

class B implements Cleanable{
.
.
.
}

final result =  GetIt.GetAll<Cleanable>() // result [A,B]

That way, when I log out, I can call clean on all "cleanable" classes. Or, better yet, let me access all registered services in the provided scope or default current, and I will filter out by type.
It will bring additional value to getIt since the developer will not have to remember to register those services with additional friction on some other form of registration management to call all of the "cleanable" services together.