feat: add NPC scale support for Minecraft 1.20.5+

[KevinDavai]

• Registered new AttributeProperty "scale" in EntityPropertyRegistryImpl
• Only active for versions 1.20.5 and above

[D3v1s0m]

@KevinDavai Simply adding the property isn’t sufficient. The look system also needs to be updated to account for scale when computing the target yaw and pitch for the NPC to face the player. I’ve tried adjusting this within the current setup, but it doesn’t behave correctly. To fix this properly, the look behavior needs to be reworked on the backend so scale is consistently factored into the calculations. I'll try to work on it today.