JSON: Be able to use other items as "addition" in custom smithing recipes

Ever since, the "minecraft:smithing_recipe_tranform" only accept the "minecraft:netherite_ingot" item as the only valid item for the "addition" parameter in the recipe. It should be able to accept any item as long as it has the "minecraft:tranform_materials" tag. This can change a lot in Bedrock Modding since we can now use Smithing Recipes for our Addons and will not be limited to other recipe types.