[K2] Spike: research the behaviour of Kotlin/Java interop around getters/setters and inheritance

[IgnatBeresnev]

Context

During the discussion of #3338, it became apparent that there are many corner cases with no obvious "correct" solution, as it depends.

Spike

The user scenario from #3338 should be researched to help us figure out how to address it:

• Try different cases, see how they work in K1/K2
• Compare it to the behaviour of IntelliJ IDEA.
• Reason about how it should work, what our users would like or expect to see.

Expected outcome of this spike:

• some summary of the research that would help us make a decision about [K2] Inconsistent member representation for Java/Kotlin files #3338 (and possibly other similar issues, but not necessarily)
• some proposals as to how [K2] Inconsistent member representation for Java/Kotlin files #3338 should be fixed, and why