remove event interface (#923)

event/README.md

@@ -1,3 +0,0 @@
-# Events
-
-* [Kafka](https://github.com/go-kratos/kafka)

event/event.go

@@ -1,34 +0,0 @@
-package event
-
-import (
-	"context"
-)
-
-// Event is an absctraction for all messages that
-// are sent to quque or received from queue.
-type Event struct {
-	// Key sets the key of the message for routing policy
-	Key string
-	// Payload for the message
-	Payload []byte
-	// Properties attach application defined properties on the message
-	Properties map[string]string
-}
-
-// Handler is a callback function that processes messages delivered
-// to asynchronous subscribers.
-type Handler func(context.Context, Event) error
-
-// Publisher is absctraction for sending messages
-// to queue.
-type Publisher interface {
-	Publish(ctx context.Context, event Event) error
-	Close() error
-}
-
-// Subscriber is an absctraction for receiving messages
-// from queue.
-type Subscriber interface {
-	Subscribe(ctx context.Context, h Handler) error
-	Close() error
-}