fix(Core/Spell): Improvements to path generation for Charge mechanic (#11534)

It has its flaws but it can be improved and it's actually a lot better than what we currently have.

src/server/shared/SharedDefines.h

@@ -3282,6 +3282,11 @@ enum SummonType
 enum EventId
 {
     EVENT_CHARGE            = 1003,
+
+    /// Special charge event which is used for charge spells that have explicit targets
+    /// and had a path already generated - using it in PointMovementGenerator will not
+    /// create a new spline and launch it
+    EVENT_CHARGE_PREPATH    = 1005,
 };
 
 enum ResponseCodes