!str #16992 Rework Source and Sink name parameter

* Remove name parameter (no overloads), naming is performed using `.withAttributes` or the new
  convenience `.named`. Those adds the OperationAttribute.Name and also change the name of the
  shape Inlet and Outlet.

* Remove Source/Sink parameter list for 0 parameter methods,
  this allows usage of `Sink.head` instead of `Sink.head()`

akka-stream-tests/src/test/scala/akka/stream/scaladsl/GraphOpsIntegrationSpec.scala

@@ -152,7 +152,7 @@ class GraphOpsIntegrationSpec extends AkkaSpec with ConversionCheckedTripleEqual
     }
 
     "be able to run plain flow" in {
-      val p = Source(List(1, 2, 3)).runWith(Sink.publisher())
+      val p = Source(List(1, 2, 3)).runWith(Sink.publisher)
       val s = SubscriberProbe[Int]
       val flow = Flow[Int].map(_ * 2)
       FlowGraph.closed() { implicit builder ⇒