New Issue: Allow 'use Mod only MyType' to bring in methods defined on MyType

16710, “lydia-duncan”, “Allow ‘use Mod only MyType’ to bring in methods defined on MyType”, “2020-11-16T17:27:19Z”

As part of the decision to stop ignoring the privacy and limitations of uses and imports when resolving methods, we desire an alternative way to bring in tertiary methods (methods defined on the type in a different module than where the type was defined). The idea is that specifying the type itself in an only list (and failing to specify the type in an except list) will bring in all methods defined on that type known by that scope.

This issue is so I have something to refer to in the test that needs to be futurized in the interim.