resurrect service stuff

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

event.go

@@ -0,0 +1,16 @@
+package micro
+
+import (
+	"context"
+
+	"github.com/unistack-org/micro/v3/client"
+)
+
+type event struct {
+	c     client.Client
+	topic string
+}
+
+func (e *event) Publish(ctx context.Context, msg interface{}, opts ...client.PublishOption) error {
+	return e.c.Publish(ctx, e.c.NewMessage(e.topic, msg), opts...)
+}