Core/Players: Implemented PlayerDataElementAccount, PlayerDataElementCharacter, PlayerDataFlagAccount and PlayerDataFlagCharacter

Port From (https://github.com/TrinityCore/TrinityCore/commit/60400d25f5fff2dabd4aa74bbdbc0d2370360a35)

Source/Game/Entities/Player/Player.Fields.cs

@@ -253,6 +253,9 @@ namespace Game.Entities
 
         PlayerCommandStates _activeCheats;
 
+        List<uint> _playerDataElementsNeedSave = new();
+        List<uint> _playerDataFlagsNeedSave = new();
+
         class ValuesUpdateForPlayerWithMaskSender : IDoWork<Player>
         {
             Player Owner;