Move Shared Packages Into Async/ (#9620)

* async packages

* change pkg

* build

* working

Co-authored-by: prylabs-bulldozer[bot] <58059840+prylabs-bulldozer[bot]@users.noreply.github.com>

async/every_test.go

@@ -0,0 +1,39 @@
+package async_test
+
+import (
+	"context"
+	"testing"
+	"time"
+
+	"github.com/prysmaticlabs/prysm/async"
+)
+
+func TestEveryRuns(t *testing.T) {
+	ctx, cancel := context.WithCancel(context.Background())
+
+	i := 0
+	async.RunEvery(ctx, 100*time.Millisecond, func() {
+		i++
+	})
+
+	// Sleep for a bit and ensure the value has increased.
+	time.Sleep(200 * time.Millisecond)
+
+	if i == 0 {
+		t.Error("Counter failed to increment with ticker")
+	}
+
+	cancel()
+
+	// Sleep for a bit to let the cancel take place.
+	time.Sleep(100 * time.Millisecond)
+
+	last := i
+
+	// Sleep for a bit and ensure the value has not increased.
+	time.Sleep(200 * time.Millisecond)
+
+	if i != last {
+		t.Error("Counter incremented after stop")
+	}
+}