+str #18793 StageLogging that allows logger access in stages (#21696)

* +str #18793 StageLogging that allows logger access in stages
Also, non ActorMaterializers can opt-into providing a logger here.

* +str #18794 add javadsl for StageLogging

* fix missing test method on compile only class

akka-stream/src/main/scala/akka/stream/impl/ActorMaterializerImpl.scala

@@ -240,6 +240,9 @@ private[akka] case class ActorMaterializerImpl(
     session.materialize().asInstanceOf[Mat]
   }
 
+  override def makeLogger(logSource: Class[_]): LoggingAdapter =
+    Logging(system, logSource)
+
   override lazy val executionContext: ExecutionContextExecutor = dispatchers.lookup(settings.dispatcher match {
     case Deploy.NoDispatcherGiven ⇒ Dispatchers.DefaultDispatcherId
     case other                    ⇒ other