feat: actions v2 execution targets command side (#7384)

Adds the API to create, update, delete targets for execution in a new ExecutionService (v3alpha)

internal/api/grpc/execution/v3alpha/server.go

@@ -0,0 +1,51 @@
+package execution
+
+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"
+	execution "github.com/zitadel/zitadel/pkg/grpc/execution/v3alpha"
+)
+
+var _ execution.ExecutionServiceServer = (*Server)(nil)
+
+type Server struct {
+	execution.UnimplementedExecutionServiceServer
+	command *command.Commands
+	query   *query.Queries
+}
+
+type Config struct{}
+
+func CreateServer(
+	command *command.Commands,
+	query *query.Queries,
+) *Server {
+	return &Server{
+		command: command,
+		query:   query,
+	}
+}
+
+func (s *Server) RegisterServer(grpcServer *grpc.Server) {
+	execution.RegisterExecutionServiceServer(grpcServer, s)
+}
+
+func (s *Server) AppName() string {
+	return execution.ExecutionService_ServiceDesc.ServiceName
+}
+
+func (s *Server) MethodPrefix() string {
+	return execution.ExecutionService_ServiceDesc.ServiceName
+}
+
+func (s *Server) AuthMethods() authz.MethodMapping {
+	return execution.ExecutionService_AuthMethods
+}
+
+func (s *Server) RegisterGateway() server.RegisterGatewayFunc {
+	return execution.RegisterExecutionServiceHandler
+}