add trigger checkpoint

source/libs/stream/src/streamCheckpoint.c

@@ -13,7 +13,6 @@
  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  */
 
-#if 0
 #include "streamInc.h"
 
 int32_t tEncodeSStreamCheckpointSourceReq(SEncoder* pEncoder, const SStreamCheckpointSourceReq* pReq) {
@@ -193,4 +192,3 @@ int32_t streamProcessCheckpointRsp(SStreamMeta* pMeta, SStreamTask* pTask, SStre
   // set status normal
   return 0;
 }
-#endif