Core/WorldSession: Add RBAC permission for skipping idle connection check

Port From (https://github.com/TrinityCore/TrinityCore/commit/7625bd960ebc4fab970fb27072aececf9e936e2f)

Source/Framework/Constants/AccountConst.cs

@@ -57,7 +57,7 @@ namespace Framework.Constants
         JoinRandomBg = 4,
         JoinArenas = 5,
         JoinDungeonFinder = 6,
-        //  7 - Reuse
+        IgnoreIdleConnection = 7,
         //  8 - Reuse
         //  9 - Reuse
         UseCharacterTemplates = 10,

Source/Game/Server/WorldSession.cs

@@ -242,7 +242,7 @@ namespace Game
             // Before we process anything:
             /// If necessary, kick the player because the client didn't send anything for too long
             /// (or they've been idling in character select)
-            if (IsConnectionIdle())
+            if (IsConnectionIdle() && !HasPermission(RBACPermissions.IgnoreIdleConnection))
                 m_Socket[(int)ConnectionType.Realm].CloseSocket();
 
             WorldPacket firstDelayedPacket = null;