Refactor pallet `claims` (#6318)

- [x] Removing `without_storage_info` and adding bounds on the stored
types for pallet `claims` - issue
https://github.com/paritytech/polkadot-sdk/issues/6289
- [x] Migrating to benchmarking V2 -
https://github.com/paritytech/polkadot-sdk/issues/6202

---------

Co-authored-by: Guillaume Thiolliere <gui.thiolliere@gmail.com>