feat: add debug events API (#8533)

# Which Problems Are Solved

Add a debug API which allows pushing a set of events to be reduced in a
dedicated projection.
The events can carry a sleep duration which simulates a slow query
during projection handling.

# How the Problems Are Solved

- `CreateDebugEvents` allows pushing multiple events which simulate the
lifecycle of a resource. Each event has a `projectionSleep` field, which
issues a `pg_sleep()` statement query in the projection handler :
  - Add
  - Change
  - Remove
- `ListDebugEventsStates` list the current state of the projection,
optionally with a Trigger
- `GetDebugEventsStateByID` get the current state of the aggregate ID in
the projection, optionally with a Trigger


# Additional Changes

- none

# Additional Context

-  Allows reproduction of https://github.com/zitadel/zitadel/issues/8517

internal/api/grpc/resources/debug_events/debug_events/server.go

@@ -0,0 +1,47 @@
+package debug_events
+
+import (
+	"google.golang.org/grpc"
+
+	"github.com/zitadel/zitadel/internal/api/authz"
+	"github.com/zitadel/zitadel/internal/api/grpc/server"
+	"github.com/zitadel/zitadel/internal/command"
+	"github.com/zitadel/zitadel/internal/query"
+	debug_events "github.com/zitadel/zitadel/pkg/grpc/resources/debug_events/v3alpha"
+)
+
+type Server struct {
+	debug_events.UnimplementedZITADELDebugEventsServer
+	command *command.Commands
+	query   *query.Queries
+}
+
+func CreateServer(
+	command *command.Commands,
+	query *query.Queries,
+) *Server {
+	return &Server{
+		command: command,
+		query:   query,
+	}
+}
+
+func (s *Server) RegisterServer(grpcServer *grpc.Server) {
+	debug_events.RegisterZITADELDebugEventsServer(grpcServer, s)
+}
+
+func (s *Server) AppName() string {
+	return debug_events.ZITADELDebugEvents_ServiceDesc.ServiceName
+}
+
+func (s *Server) MethodPrefix() string {
+	return debug_events.ZITADELDebugEvents_ServiceDesc.ServiceName
+}
+
+func (s *Server) AuthMethods() authz.MethodMapping {
+	return debug_events.ZITADELDebugEvents_AuthMethods
+}
+
+func (s *Server) RegisterGateway() server.RegisterGatewayFunc {
+	return debug_events.RegisterZITADELDebugEventsHandler
+}