Add Stop() for uber/fx hook

[isfk]

I used emque as regular Go package in my project like this(project used uber/fx):

https://pkg.go.dev/go.uber.org/fx#StopHook

func NewBroker(lc fx.Lifecycle, log *zap.Logger, conf *configv1.Config) *Broker {
	srvOptions := []server.Option{
		server.WithAddress(":8081"),
	}

	server := httpsrv.New(srvOptions...)

	lc.Append(fx.Hook{
		OnStart: func(ctx context.Context) error {
			log.Sugar().Infof("Starting Broker server at %v", 8081)
			go func() {
				if err := server.Run(); err != nil {
					log.Sugar().Errorf("Broker server err: %v", err)
				}
			}()
			return nil
		},
		OnStop: func(ctx context.Context) error {
			log.Sugar().Infof("Stopping Broker server")
			return server.Stop()
		},
	})

	return &Broker{}
}

So i add Stop() to Server

type Server interface {
	Run() error
	Stop() error
}