fix(Core/Movement): add creature formation movement generator (#25030)

Co-authored-by: Shauren <shauren.trinity@gmail.com>
Co-authored-by: Rocco Silipo <108557877+Rorschach91@users.noreply.github.com>

src/server/game/Movement/MotionMaster.cpp

@@ -21,6 +21,7 @@
 #include "CreatureAISelector.h"
 #include "EscortMovementGenerator.h"
 #include "FleeingMovementGenerator.h"
+#include "FormationMovementGenerator.h"
 #include "GameTime.h"
 #include "HomeMovementGenerator.h"
 #include "IdleMovementGenerator.h"
@@ -466,6 +467,17 @@ void MotionMaster::MoveFollow(Unit* target, float dist, float angle, MovementSlo
     }
 }
 
+void MotionMaster::MoveFormation(Unit* leader, float dist, float angle, uint32 point1, uint32 point2)
+{
+    if (!leader || leader == _owner || _owner->HasUnitFlag(UNIT_FLAG_DISABLE_MOVE))
+        return;
+
+    if (!_owner->IsCreature())
+        return;
+
+    Mutate(new FormationMovementGenerator(leader, dist, angle, point1, point2), MOTION_SLOT_IDLE);
+}
+
 /**
  * @brief The unit will move to a specific point. Doesn't work with UNIT_FLAG_DISABLE_MOVE
  *