FunctionalExpressionsIdentity inspection (IDEA-154488)

[OljaKli]

Reports objects which are a subtype of java.util.Set or java.util.Map that may contain keys of functional interface type. In such situations non-captured lambdas/method references could be stored in sets which could lead to unexpected results because lambdas can be reused.

[akozlova]

Please rebase on master as we have monorepo now, sorry for that!