startUsingItem and stopUsingItem methods for LivingEntity

[Keisimm]

Is your feature request related to a problem?

I needed to make a skeleton stretch its bow before invoking ProjectileSource#launchProjectile(). I analyzed the Bukkit API, but there doesn't seem to be a method for this purpose (or am I mistaken?). In NMS (Mojang Mappings), there's the LivingEntity#startUsingItem(InteractionHand) method - that's the solution.

Describe the solution you'd like.

Implement these methods to the Bukkit LivingEntity class:

public void startUsingItem(EquipmentSlot slot) {
if(slot == EquipmentSlot.HAND) getHandle().startUsingItem(InteractionHand.MAIN_HAND);
else if(slot == EquipmentSlot.OFF_HAND) getHandle().startUsingItem(InteractionHand.OFF_HAND);
}

public void stopUsingItem() {
getHandle().stopUsingItem();
}

Describe alternatives you've considered.

Direct use of NMS.

Other

No response

[Machine-Maker]

There already is a "stopUsingItem" method in LivingEntity#clearActiveItem, but there probably is a good use for exposing the start method.

Some testing should be done on what happens when you call it on a Player as that is usually started at the same time as the client. But otherwise, sounds good to have.