Add WithRegisterFunc and WithAuthenticator methods to GRPCServerBuilder

- Move grpc package to pkg/grpc/builder/ for better organization
- Add WithRegisterFunc method to support custom gRPC service registration
- Add WithAuthenticator method to support authentication chain
- Update tests to cover new methods and remove references to non-existent methods
- Add TODO for future authorizers support

Signed-off-by: xuezhaojun <zxue@redhat.com>

Author: xuezhaojun

pkg/cloudevents/server/grpc/authz/interface.go

@@ -6,6 +6,7 @@ import (
 	"open-cluster-management.io/sdk-go/pkg/cloudevents/generic/types"
 )
 
+// TODO: @xuezhaojun Migration to pkg/grpc/authz later.
 type Authorizer interface {
 	Authorize(ctx context.Context, cluster string, eventsType types.CloudEventsType) error
 }

pkg/cloudevents/server/grpc/broker.go

@@ -13,7 +13,6 @@ import (
 	"github.com/cloudevents/sdk-go/v2/binding"
 	cloudeventstypes "github.com/cloudevents/sdk-go/v2/types"
 	"github.com/google/uuid"
-	"google.golang.org/grpc"
 	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/status"
 	"google.golang.org/protobuf/types/known/emptypb"
@@ -56,10 +55,6 @@ func NewGRPCBroker() *GRPCBroker {
 	return broker
 }
 
-func (bkr *GRPCBroker) Register(grpcServer *grpc.Server) {
-	pbv1.RegisterCloudEventServiceServer(grpcServer, bkr)
-}
-
 func (bkr *GRPCBroker) RegisterService(t types.CloudEventsDataType, service server.Service) {
 	bkr.services[t] = service
 	service.RegisterHandler(bkr)

pkg/cloudevents/server/grpc/broker_test.go

@@ -9,6 +9,7 @@ import (
 	cloudevents "github.com/cloudevents/sdk-go/v2"
 	"google.golang.org/grpc"
 	grpccli "open-cluster-management.io/sdk-go/pkg/cloudevents/generic/options/grpc"
+	pbv1 "open-cluster-management.io/sdk-go/pkg/cloudevents/generic/options/grpc/protobuf/v1"
 	cetypes "open-cluster-management.io/sdk-go/pkg/cloudevents/generic/types"
 	"open-cluster-management.io/sdk-go/pkg/cloudevents/server"
 )
@@ -61,7 +62,7 @@ func TestServer(t *testing.T) {
 	grpcServerOptions := []grpc.ServerOption{}
 	grpcServer := grpc.NewServer(grpcServerOptions...)
 	grpcEventServer := NewGRPCBroker()
-	grpcEventServer.Register(grpcServer)
+	pbv1.RegisterCloudEventServiceServer(grpcServer, grpcEventServer)
 
 	svc := &testService{evts: make(map[string]*cloudevents.Event)}
 	grpcEventServer.RegisterService(dataType, svc)