add getAnn()

Author: SiyaoIsHiding

query-builder/src/main/java/com/datastax/oss/driver/internal/querybuilder/select/DefaultSelect.java

@@ -554,6 +554,11 @@ public Object getLimit() {
     return limit;
   }
 
+  @Nullable
+  public Ann getAnn() {
+    return ann;
+  }
+
   @Nullable
   public Object getPerPartitionLimit() {
     return perPartitionLimit;