Core/Movement: Allow specifying timeout for follow movement

Port From (https://github.com/TrinityCore/TrinityCore/commit/39b76cfbc2022b9ba21786d235927fa3bbdf04eb)

Source/Game/Movement/Generators/FollowMovementGenerator.cs

@@ -17,12 +17,13 @@ namespace Game.Movement
         ChaseAngle _angle;
 
         TimeTracker _checkTimer;
+        TimeTracker _duration;
         PathGenerator _path;
         Position _lastTargetPosition;
 
         AbstractFollower _abstractFollower;
 
-        public FollowMovementGenerator(Unit target, float range, ChaseAngle angle)
+        public FollowMovementGenerator(Unit target, float range, ChaseAngle angle, TimeSpan? duration)
         {
             _abstractFollower = new AbstractFollower(target);
             _range = range;
@@ -33,6 +34,9 @@ namespace Game.Movement
             Flags = MovementGeneratorFlags.InitializationPending;
             BaseUnitState = UnitState.Follow;
 
+            if (duration.HasValue)
+                _duration = new(duration.Value);
+
             _checkTimer = new(CHECK_INTERVAL);
         }
 
@@ -64,6 +68,17 @@ namespace Game.Movement
             if (target == null || !target.IsInWorld)
                 return false;
 
+            if (_duration != null)
+            {
+                _duration.Update(diff);
+                if (_duration.Passed())
+                {
+                    owner.StopMoving();
+                    DoMovementInform(owner, target);
+                    return false;
+                }
+            }
+
             if (owner.HasUnitState(UnitState.NotMove) || owner.IsMovementPreventedByCasting())
             {
                 _path = null;

Source/Game/Movement/MotionMaster.cs

@@ -542,7 +542,7 @@ namespace Game.Movement
             if (target == null)
                 Add(new HomeMovementGenerator<Creature>());
             else
-                Add(new FollowMovementGenerator(target, SharedConst.PetFollowDist, new ChaseAngle(SharedConst.PetFollowAngle)));
+                Add(new FollowMovementGenerator(target, SharedConst.PetFollowDist, new ChaseAngle(SharedConst.PetFollowAngle), null));
         }
 
         public void MoveRandom(float wanderDistance = 0.0f, TimeSpan? duration = null)
@@ -551,15 +551,15 @@ namespace Game.Movement
                 Add(new RandomMovementGenerator(wanderDistance, duration), MovementSlot.Default);
         }
 
-        public void MoveFollow(Unit target, float dist, float angle = 0.0f, MovementSlot slot = MovementSlot.Active) { MoveFollow(target, dist, new ChaseAngle(angle), slot); }
+        public void MoveFollow(Unit target, float dist, float angle = 0.0f, TimeSpan? duration = null, MovementSlot slot = MovementSlot.Active) { MoveFollow(target, dist, new ChaseAngle(angle), duration, slot); }
 
-        public void MoveFollow(Unit target, float dist, ChaseAngle angle, MovementSlot slot = MovementSlot.Active)
+        public void MoveFollow(Unit target, float dist, ChaseAngle angle, TimeSpan? duration = null, MovementSlot slot = MovementSlot.Active)
         {
             // Ignore movement request if target not exist
             if (!target || target == _owner)
                 return;
 
-            Add(new FollowMovementGenerator(target, dist, angle), slot);
+            Add(new FollowMovementGenerator(target, dist, angle, duration), slot);
         }
 
         public void MoveChase(Unit target, float dist, float angle = 0.0f) { MoveChase(target, new ChaseRange(dist), new ChaseAngle(angle)); }