Gobber2 Alloyable

Adds "METAL" category to Gobber2 ingots making them alloyable within Metal Alloyer!

With this change, you can use your precious End Gobber ingots with other overpowered ingots!

Datapack was made for 1.20.1 (Silent Gear 3) but will propably work on all versions past 1.15, 1.21 version of Silent Gear introduced some changes that could break this datapack, so check on fresh world before using it!