[ipfs/go-bitswap] Check wantlists by multihash

[Winterhuman]

As mentioned at https://github.com/ipfs/boxo/issues/420, Bitswap apparently still checks wantlists by CID instead of multihash

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[guseggert]

Sounds reasonable. When we pick this up, make sure specs are up-to-date https://github.com/ipfs/specs/blob/main/BITSWAP.md#bitswap-110

[welcome[bot]]

Thank you for submitting your first issue to this repository! A maintainer will be here shortly to triage and review. In the meantime, please double-check that you have provided all the necessary information to make this process easy! Any information that can help save additional round trips is useful! We currently aim to give initial feedback within two business days. If this does not happen, feel free to leave a comment. Please keep an eye on how this issue will be labeled, as labels give an overview of priorities, assignments and additional actions requested by the maintainers:

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