move implementations to external repos (#17)

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

broker/memory/memory_test.go

@@ -1,50 +0,0 @@
-package memory
-
-import (
-	"fmt"
-	"testing"
-
-	"github.com/unistack-org/micro/v3/broker"
-)
-
-func TestMemoryBroker(t *testing.T) {
-	b := NewBroker()
-
-	if err := b.Connect(); err != nil {
-		t.Fatalf("Unexpected connect error %v", err)
-	}
-
-	topic := "test"
-	count := 10
-
-	fn := func(m *broker.Message) error {
-		return nil
-	}
-
-	sub, err := b.Subscribe(topic, fn)
-	if err != nil {
-		t.Fatalf("Unexpected error subscribing %v", err)
-	}
-
-	for i := 0; i < count; i++ {
-		message := &broker.Message{
-			Header: map[string]string{
-				"foo": "bar",
-				"id":  fmt.Sprintf("%d", i),
-			},
-			Body: []byte(`hello world`),
-		}
-
-		if err := b.Publish(topic, message); err != nil {
-			t.Fatalf("Unexpected error publishing %d", i)
-		}
-	}
-
-	if err := sub.Unsubscribe(); err != nil {
-		t.Fatalf("Unexpected error unsubscribing from %s: %v", topic, err)
-	}
-
-	if err := b.Disconnect(); err != nil {
-		t.Fatalf("Unexpected connect error %v", err)
-	}
-}