* Implement parsing for #[pallet::storage_name] on storage items
* Rename storage prefix when a #[pallet::storage_name] is supplied
* Fix test_storage_info
* Rename storage_name to storage_prefix
* Check for duplicates when renaming storage prefixes
* Allow only string literals for storage_prefix renames
* Use proper spans for attribute errors
* Check for valid identifiers when parsing storage prefix renames