IPIP-428: Allowing V2-Only Records in IPNS

[lidel]

Closes https://github.com/ipfs/specs/issues/376

This IPIP introduces support for creation and validation of compact, V2-only IPNS Records.

• [x] boxo/ipns implementation
  • done: https://github.com/ipfs/boxo/pull/339
• [x] ping helia cc @achingbrain
  • [ ] PR js-ipns implementation (@hacdias) https://github.com/ipfs/js-ipns/pull/234
• [x] ping ipfs-chromium impl. cc @John-LittleBearLabs
• [x] ping nabu cc @ianopolous
• [x] ping capyloon cc @fabricedesre
• [x] ping w3name cc @alanshaw
• [x] update Test fixtures section after we have them in gateway-conformance