MavenResolverSystemImpl should implement MavenWorkingSessionContainer

Given:

I have MavenResolverSystem instance retrieved via Maven.resolver() call.

When:

I want to debug internals of the system.

Expect:

Instance can be type-casted to MavenWorkingSessionContainer, which allows to get direct access to the session that can later be investigated - loaded dependency management, dependencies to be resolved and so on.

Actual behavior:

Cast fails, as MavenResolverySystemImpl does not implement MavenWorkingSessionContainer, although it internally contains the session.