+clu #15365 Make cluster.UniqueAddress public
Merge pull request #15366 from akka/wip-15365-UniqueAddress-patriknw

+clu #15365 Make cluster.UniqueAddress public
=pro,per filtering MiMa warnings in persistence
Merge pull request #15390 from ktoso/fix-mima-issues-ktoso

=pro,per mute mima errors in persistence-experimental
+per #15138 #15000 minor missing java APIs
This is for the deprecated PersistentChannel, pushing since such easy fix

Resolves #15138
Resolves #15000
Merge pull request #15378 from ktoso/per-minor-java-missing-api

+per added missing Java APIs
+tes #15132 Add additional overloaded expectMsg to TestKit

Conflicts:
	akka-testkit/src/main/scala/akka/testkit/TestKit.scala