Iron Bird Nether Mob

A new hostile flying enemy that would spawn in the Nether, specifically in the new Basalt Deltas. This enemy would cover several things missing from the Nether Update:

- A new ranged mob outside of Blazes (structure-locked) and Ghasts (very different from most ranged enemies, and most enemies in general)
- A new flying mob that could challenge the player over the Lava oceans of the Nether
- A source of both Iron and Feathers, since neither is very easily obtainable in the Nether right now (this would also explain how Piglins make their Crossbows and get their Iron)
- A unique design for a mob, since there are no bird-like enemies in Minecraft yet
- Another mob for the Basalt Deltas besides Magma Cubes, and one that fits well with the rough terrain

As for how the mob could behave, perhaps it'd fly around and attack Piglins and/or Striders. It could circle around its foe, then pause in the air and flap its wings to unleash a barrage of projectiles (probably sharp feathers). By pausing in the air, it wouldn't be a pain to hit like Phantoms are, hopefully making it much more fun to fight. It could perhaps also have a swooping attack, just so it isn't impossible to fight without a Bow.