Better detection of unnecessary stubbing

[PHaroZ]

Automatic verification confirmation introduces a new mechanism that ensure that all declared stubs are verified. This is cool but doesn't exactly match which is requested in #558 and exposed in mockito doc

This PR add a new checkUnnecessaryStub() method, and its companion JUnit annotion @CheckUnnecessaryStub.

The main usecase of this feature is to avoid the verify steps when all stubs are done with precision and every stubs are used only once.

[Raibaz]

This is pretty cool, thanks a lot!

I just have a doubt about a minor change, but apart from that LGTM.

[Raibaz]

Still, I really don't know why tests are failing though.

Would you please take a look? Thanks again!

[PHaroZ]

This seems due to the fact I put InvocationAnswer as a key of a HashMap, the hashCode of Answer try to be computed but it fails for some reason thaht I don't understand well (linked to io.mockk.impl.recording.states.CallRecordingState#cancelAndThrowBadRecordingState ).

I changed the implementation of my feature and get rid of the HashMap. All tests should be green :)

[Raibaz]

Thanks again!