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Dastan
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# Description - What does this PR do? While working with `pallet_nfts` through `nonfungibles_v2` traits `Inspect, Mutate`, I found out that once you have set the collection attribute with `<Nfts as Mutate>::set_collection_attribute()`, it's not possible to read it with `<Nfts as Inspect>::collection_attribute()` since they use different `namespace` values. When setting the attribute, `AttributeNamespace::Pallet` is used, while `AttributeNamespace::CollectionOwner` is used when reading. more context: https://github.com/freeverseio/laos/issues/7#issuecomment-1766137370 This PR makes `item` an optional parameter in `Inspect::system_attribute()`, to be able to read collection attributes. - Why are these changes needed? To be able to read collection level attributes when reading attributes of the collection. It will be possible to read collection attributes by passing `None` for `item` - How were these changes implemented and what do they affect? `NftsApi` is also affected and `NftsApi::system_attribute()` now accepts optional `item` parameter. ## Breaking change Because of the change in the `NftsApi::system_attribute()` method's `item` param, parachains who integrated the `NftsApi` need to update their API code and frontend integrations accordingly. AssetHubs are unaffected since the NftsApi wasn't released on those parachains yet.