Core/Objects: Unify Searcher classes into one common implementation

Port From (https://github.com/TrinityCore/TrinityCore/commit/261eb201bf107cef441d9b075e8f23bf0edfbaf0)
Port From (https://github.com/TrinityCore/TrinityCore/commit/526b16fea41fb69a302fdebe8a727e175949f04b)
Port From (https://github.com/TrinityCore/TrinityCore/commit/8b7dce6521323e788ebf28297ec941a6f9bf876f)
Port From (https://github.com/TrinityCore/TrinityCore/commit/5334467f493eb16141f4ad0bce956bc3e19244a0)
Port From (https://github.com/TrinityCore/TrinityCore/commit/1e7725c15b149baaf96731231239769e482ec2ed)
Port From (https://github.com/TrinityCore/TrinityCore/commit/21712f475383f6f3fae107706f5de5195f75b760)

Source/Game/Entities/Corpse.cs

@@ -320,7 +320,7 @@ namespace Game.Entities
         long m_time;
         CellCoord _cellCoord;                                    // gride for corpse position for fast search
 
-        class ValuesUpdateForPlayerWithMaskSender : IDoWork<Player>
+        class ValuesUpdateForPlayerWithMaskSender
         {
             Corpse Owner;
             ObjectFieldData ObjectMask = new();
@@ -340,6 +340,8 @@ namespace Game.Entities
                 udata.BuildPacket(out UpdateObject packet);
                 player.SendPacket(packet);
             }
+
+            public static implicit operator IDoWork<Player>(ValuesUpdateForPlayerWithMaskSender obj) => obj.Invoke;
         }
     }
 }