[FEAT MERGE] incremental direct load phase I

Co-authored-by: Monk-Liu <1152761042@qq.com>
Co-authored-by: suz-yang <suz.yang@foxmail.com>
Co-authored-by: ZenoWang <wzybuaasoft@163.com>

mittest/mtlenv/storage/test_memtable_v2.cpp

@@ -3580,10 +3580,13 @@ int ObTxCtxTable::release_ref_()
 
   return ret;
 }
+void ObITabletMemtable::unset_logging_blocked_for_active_memtable_()
+{
+}
 } // namespace storage
 
-namespace memtable
-{
+namespace memtable{
+
 int ObMemtable::lock_row_on_frozen_stores_(
     const storage::ObTableIterParam &,
     const ObTxNodeArg &,
@@ -3599,9 +3602,6 @@ int ObMemtable::lock_row_on_frozen_stores_(
     return OB_SUCCESS;
   }
 }
-void ObMemtable::unset_logging_blocked_for_active_memtable()
-{
-}
 }
 
 namespace transaction