feat: add batch create and server info APIs (#540)

pkg/rest/model/task.go

@@ -7,3 +7,8 @@ type CreateTask struct {
 	Req *base.Request `json:"req"`
 	Opt *base.Options `json:"opt"`
 }
+
+type CreateTaskBatch struct {
+	Reqs []*base.Request `json:"reqs"`
+	Opt  *base.Options   `json:"opt"`
+}