Chunked messages in reliable delivery, #24276 (#28915)

* To avoid head of line blocking from serialization and transfer of large messages
  this can be enabled.
* ProducerController setting to chunk messages
* split up large messages in chunks in ProducerController
  and assemble again in ConsumerController
* serialization moved to these actors instead of in the Artery stream
* other messages (for other actors) can interleave with the chunks
* serializer for ChunkedMessage in SequencedMessage and MessageSent
* cleanup partially stored chunked messages
* reference docs
* mima filters
* additional test for sending the Request after half window size
* enforce that chunk-large-messages=off for sharding and work-pulling

akka-docs/src/test/scala/docs/persistence/PersistenceSchemaEvolutionDocSpec.scala

@@ -5,8 +5,6 @@
 package docs.persistence
 
 import java.io.NotSerializableException
-
-import scala.language.reflectiveCalls
 import java.nio.charset.Charset
 
 import akka.actor.ActorSystem
@@ -16,8 +14,8 @@ import akka.testkit.TestKit
 import com.typesafe.config._
 import org.scalatest.wordspec.AnyWordSpec
 import spray.json.JsObject
-
 import scala.concurrent.duration._
+
 import docs.persistence.proto.FlightAppModels
 
 class PersistenceSchemaEvolutionDocSpec extends AnyWordSpec {
@@ -284,7 +282,7 @@ class RemovedEventsAwareSerializer extends SerializerWithStringManifest {
       case m if SkipEventManifestsEvents.contains(m) =>
         EventDeserializationSkipped
 
-      case other => new String(bytes, utf8)
+      case _ => new String(bytes, utf8)
     }
 }
 //#string-serializer-skip-deleved-event-by-manifest