Add a way to categorize projectiles

It would be very useful to allow projectiles to have custom tags (much like attributes or NBT tags), enabling them to be categorized, similar to how entities or items can be tagged. For example, assigning a custom tag like "magic" to a projectile would let it be recognized as such during interactions with entities / world. This could lead to different effects or logic based on the projectile's tag.

This feature would be especially useful when working with many different types of projectiles. Instead of making separate logic for each one, you could group them by category and handle them using shared procedures. It would improve both organization and performance in complex mods.