add cmd/open_im_push

internal/push/sdk/tpns-server-sdk-go/go/common/json_helper.go

@@ -0,0 +1,8 @@
+package common
+
+import "encoding/json"
+
+func ToJson(v interface{}) string {
+	bs, _ := json.Marshal(v)
+	return string(bs)
+}