[Quest API] Add GetDefaultRaceSize() to Perl/Lua (#2993)

# Perl
- Add `$mob->GetDefaultRaceSize()`.

# Lua
- Add `mob:GetDefaultRaceSize()`.

# Notes
- Allows operators to get the default race size of a race if they want to use it in a script.

zone/lua_mob.h

@@ -513,6 +513,7 @@ public:
 	void CopyHateList(Lua_Mob to);
 	bool IsAttackAllowed(Lua_Mob target);
 	bool IsAttackAllowed(Lua_Mob target, bool is_spell_attack);
+	float GetDefaultRaceSize();
 };
 
 #endif