AM - Mobs leveling system

[NEW] Added Protection to Mob Levels:

- Mobs now have a protection attribute that scales with their level.

[NEW] Added Speed to Mob Levels:

- Mobs gain a speed boost as their level increases, making them faster and more dangerous.

[NEW] Added NBT Tag "am_lvl" to Entities:

- A new NBT tag "am_lvl" has been added to track the level of entities.

[NEW] Extra XP Based on Level:

- Mobs now drop extra XP depending on their level, rewarding players more for tougher battles.

[NEW] Added Configuration Options:

- You can now configure the following modifiers:
	- `damage_modifier`: Adjust the damage output of mobs based on their level.
	- `health_modifier`: Control the health scaling of mobs by level.
	- `protection_modifier`: Modify the protection attribute based on mob level.
	- `speed_modifier`: Set the speed increase for mobs as they level up.
	- `xp_modifier`: Adjust the extra XP awarded based on the mob's level.