chore: resolve review comments

refactor: item metadata

fix: item metadata tests

test(nonfungibles): add mint and burn tests

refactor: non fungibles sub0 (#364)

Co-authored-by: Tin Chung <[email protected]>

fix: pallet tests + integration tests

refactor: remove unused types

refactor(nonfungibles): CollectionConfig parameter

chore: remove unused code

runtime/devnet/src/config/api/mod.rs

@@ -279,7 +279,7 @@ impl<T: frame_system::Config> Contains<RuntimeRead> for Filter<T> {
 mod tests {
 	use codec::Encode;
 	use pallet_api::fungibles::Call::*;
-	use pallet_nfts::{CollectionSettings, MintSettings, MintWitness};
+	use pallet_nfts::MintWitness;
 	use sp_core::{bounded_vec, crypto::AccountId32};
 	use RuntimeCall::{Balances, Fungibles, NonFungibles};