Refactor notifications (#2688)

This PR changes the handling of notifications
- removes the `StreamEvent` and `ReadUpdate` stream
- listens on the `OutputRoomEvent` stream in the UserAPI to inform the
SyncAPI about unread notifications
- listens on the `OutputReceiptEvent` stream in the UserAPI to set
receipts/update notifications
- sets the `read_markers` directly from within the internal UserAPI

Co-authored-by: Neil Alexander <neilalexander@users.noreply.github.com>

setup/jetstream/nats.go

@@ -9,9 +9,10 @@ import (
 	"time"
 
 	"github.com/getsentry/sentry-go"
+	"github.com/sirupsen/logrus"
+
 	"github.com/matrix-org/dendrite/setup/config"
 	"github.com/matrix-org/dendrite/setup/process"
-	"github.com/sirupsen/logrus"
 
 	natsserver "github.com/nats-io/nats-server/v2/server"
 	natsclient "github.com/nats-io/nats.go"
@@ -184,6 +185,8 @@ func setupNATS(process *process.ProcessContext, cfg *config.JetStream, nc *natsc
 		OutputSendToDeviceEvent: {"SyncAPIEDUServerSendToDeviceConsumer", "FederationAPIEDUServerConsumer"},
 		OutputTypingEvent:       {"SyncAPIEDUServerTypingConsumer", "FederationAPIEDUServerConsumer"},
 		OutputRoomEvent:         {"AppserviceRoomserverConsumer"},
+		OutputStreamEvent:       {"UserAPISyncAPIStreamEventConsumer"},
+		OutputReadUpdate:        {"UserAPISyncAPIReadUpdateConsumer"},
 	} {
 		streamName := cfg.Matrix.JetStream.Prefixed(stream)
 		for _, consumer := range consumers {

setup/jetstream/streams.go

@@ -94,16 +94,6 @@ var streams = []*nats.StreamConfig{
 		Retention: nats.InterestPolicy,
 		Storage:   nats.FileStorage,
 	},
-	{
-		Name:      OutputStreamEvent,
-		Retention: nats.InterestPolicy,
-		Storage:   nats.FileStorage,
-	},
-	{
-		Name:      OutputReadUpdate,
-		Retention: nats.InterestPolicy,
-		Storage:   nats.FileStorage,
-	},
 	{
 		Name:      OutputPresenceEvent,
 		Retention: nats.InterestPolicy,