Carpet Sky Additions - Create compat

Changes: - When player kills drowned, they have a chance to drop dried kelp and zinc ingot. - When player kills zombies, they have a chance to drop andesite alloy. - When fishing there is a slim chance to get andesite alloy.

No vanilla drops were deleted or replaced.

If you are wondering why I think just these are enough: I think that given default create mod recipes, there is no need to add more drops. Everything is accessible even with this limited amount of changes. Although, I might do something for automated zinc production later.

Edit: Put on hold. Not sure when I will come back to this project