proto nesting causes template generation problems

[songzhibin97]

What happened:

message CreateTemplate {
    message Request {
        string template_name = 1;
        string bind_interface_key = 2;
        map<string, string> meta = 3;
    }
    message Response {
        message Data {
            int64 template_id = 1;
        }
        int64 code = 1;
        string message = 2;
        Data data = 3;
    }
}

message GetTemplates {
    message Request {
        int64 page = 1;
        int64 page_size = 2;
    }

    message Response {
        message Data {
            int64 template_id = 1;
            string template_name = 2;
        }
        int64 code = 1;
        string message = 2;
        Data data = 3;
    }
}

generate server

func (s *TemplateService) CreateTemplate(ctx context.Context, req *pb.CreateTemplate.Request) (*pb.CreateTemplate.Response, error) {
	return &pb.CreateTemplate.Response{}, nil
}
func (s *TemplateService) GetTemplates(ctx context.Context, req *pb.GetTemplates.Request) (*pb.GetTemplates.Response, error) {
	return &pb.GetTemplates.Response{}, nil
}
func (s *TemplateService) GetTemplateById(ctx context.Context, req *pb.GetTemplateById.Request) (*pb.GetTemplateById.Response, error) {
	return &pb.GetTemplateById.Response{}, nil
}
func (s *TemplateService) SaveTemplateById(ctx context.Context, req *pb.SaveTemplateById.Request) (*pb.SaveTemplateById.Response, error) {
	return &pb.SaveTemplateById.Response{}, nil
}
func (s *TemplateService) DeleteTemplateById(ctx context.Context, req *pb.DeleteTemplateById.Request) (*pb.DeleteTemplateById.Response, error) {
	return &pb.DeleteTemplateById.Response{}, nil
}

...

What you expected to happen:

How to reproduce it (as minimally and precisely as possible):

Anything else we need to know?:

Environment:

• Kratos version (use kratos -v):
  kratos version v2.6.1
• Go version (use go version):
  1.19
• OS (e.g: cat /etc/os-release):
  mac
• Others: