fix: ConsumerFilterRegistry unique actor name

[patriknw]

Noticed this occasionally:

Caused by: akka.grpc.GrpcServiceException: NOT_FOUND: Stream id [customer] is not available for consumption
	at akka.grpc.GrpcServiceException$.apply(GrpcServiceException.scala:40)
	at akka.grpc.internal.RequestBuilderImpl$.lift(RequestBuilderImpl.scala:481)
	at akka.grpc.internal.RequestBuilderImpl$$anonfun$richErrorStream$1.applyOrElse(RequestBuilderImpl.scala:473)
	at akka.grpc.internal.RequestBuilderImpl$$anonfun$richErrorStream$1.applyOrElse(RequestBuilderImpl.scala:472)
	at akka.stream.impl.fusing.RecoverWith$$anon$43.akka$stream$impl$fusing$RecoverWith$$anon$$onFailure(Ops.scala:2156)
	at akka.stream.impl.fusing.RecoverWith$$anon$43.onUpstreamFailure(Ops.scala:2151)
	... 21 more

09:00:06.737 ERROR akka.actor.typed.Behavior$ - Supervisor StopSupervisor saw failure: actor name [customer] is not unique!
akka.actor.InvalidActorNameException: actor name [customer] is not unique!
	at akka.actor.dungeon.ChildrenContainer$TerminatingChildrenContainer.reserve(ChildrenContainer.scala:200)
	at akka.actor.dungeon.Children.reserveChild(Children.scala:154)
	at akka.actor.dungeon.Children.reserveChild$(Children.scala:152)
	at akka.actor.ActorCell.reserveChild(ActorCell.scala:408)
	at akka.actor.dungeon.Children.makeChild(Children.scala:307)
	at akka.actor.dungeon.Children.actorOf(Children.scala:56)
	at akka.actor.dungeon.Children.actorOf$(Children.scala:55)
	at akka.actor.ActorCell.actorOf(ActorCell.scala:408)
	at akka.actor.typed.internal.adapter.ActorRefFactoryAdapter$.spawn(ActorRefFactoryAdapter.scala:55)
	at akka.actor.typed.internal.adapter.ActorContextAdapter.spawn(ActorContextAdapter.scala:73)
	at akka.projection.grpc.internal.ConsumerFilterRegistry.getOrCreateStore$1(ConsumerFilterRegistry.scala:64)
	at akka.projection.grpc.internal.ConsumerFilterRegistry.$anonfun$behavior$3(ConsumerFilterRegistry.scala:125)
	at akka.actor.typed.internal.BehaviorImpl$ReceiveMessageBehavior.receive(BehaviorImpl.scala:152)
	at akka.actor.typed.Behavior$.interpret(Behavior.scala:282)
	at akka.actor.typed.Behavior$.interpretMessage(Behavior.scala:238)
	at akka.actor.typed.internal.InterceptorImpl$$anon$2.apply(InterceptorImpl.scala:57)
	at akka.actor.typed.internal.SimpleSupervisor.aroundReceive(Supervision.scala:129)
	at akka.actor.typed.internal.InterceptorImpl.receive(InterceptorImpl.scala:85)
	at akka.actor.typed.Behavior$.interpret(Behavior.scala:282)
	at akka.actor.typed.Behavior$.interpretMessage(Behavior.scala:238)
	at akka.actor.typed.internal.adapter.ActorAdapter.handleMessage(ActorAdapter.scala:133)
	at akka.actor.typed.internal.adapter.ActorAdapter.aroundReceive(ActorAdapter.scala:109)

[patriknw]

Alternative could be to watch the store remove it from the stores Map when Terminated is received. That would probably be more clean, but maybe increases the risk of sending a UpdateFilter message to a store that is about to terminate.

[johanandren]

LGTM