Singleton & scoped services exposing multiple services should return the same instance

[hikalkan]

Currently, if you expose multiple services, like IMyFirstService, IMySecondService and MyClass, from a MyClass class (which is registered as singleton), then you resolve/inject the the same service with different references, you get different instances.

If you always resolve with IMyFirstService you always get the same object. However, when you resolve with IMySecondService then you get a second instance.

This is not a good thing for singletons since you expect a real single instance.

This change makes it always returning the same instance even if you resolve it with different type references.

While this is a breaking change, it should not effect any application. Even it fixes some problems like #3777

Also, it is similar with scoped lifetime. From now, you get the exact same instance in the same scope for scoped registered services.