管理员解绑充电桩，删除对应的充电桩预约设置

jsowell-pile/src/main/java/com/jsowell/pile/mapper/PileReservationInfoMapper.java

@@ -37,4 +37,11 @@ public interface PileReservationInfoMapper {
     PileReservationInfo selectByPileConnectorCode(String pileConnectorCode);
 
     PileReservationInfo selectByPileSn(String pileSn);
+
+    /**
+     * 根据桩编号删除预约记录
+     * @param pileSn
+     * @return
+     */
+    int deleteByPileSn(String pileSn);
 }