refactor(notification): use new queue package (#9360)

# Which Problems Are Solved

The recently introduced notification queue have potential race conditions.

# How the Problems Are Solved

Current code is refactored to use the queue package, which is safe in
regards of concurrency.

# Additional Changes

- the queue is included in startup
- improved code quality of queue

# Additional Context

- closes https://github.com/zitadel/zitadel/issues/9278

internal/eventstore/aggregate.go

@@ -78,15 +78,15 @@ func AggregateFromWriteModelCtx(
 // Aggregate is the basic implementation of Aggregater
 type Aggregate struct {
 	// ID is the unique identitfier of this aggregate
-	ID string `json:"-"`
+	ID string `json:"id"`
 	// Type is the name of the aggregate.
-	Type AggregateType `json:"-"`
+	Type AggregateType `json:"type"`
 	// ResourceOwner is the org this aggregates belongs to
-	ResourceOwner string `json:"-"`
+	ResourceOwner string `json:"resourceOwner"`
 	// InstanceID is the instance this aggregate belongs to
-	InstanceID string `json:"-"`
+	InstanceID string `json:"instanceId"`
 	// Version is the semver this aggregate represents
-	Version Version `json:"-"`
+	Version Version `json:"version"`
 }
 
 // AggregateType is the object name

internal/eventstore/event_base.go

@@ -22,7 +22,7 @@ type BaseEvent struct {
 	ID        string
 	EventType EventType `json:"-"`
 
-	Agg *Aggregate
+	Agg *Aggregate `json:"-"`
 
 	Seq                           uint64
 	Pos                           float64