Create spec for (allow|deny)lists for IPFS Nodes and Gateways

[foreseaz]

Open issue for IPIP: Denylists for IPFS Nodes and Gateways.

PR: #299

[lidel]

Thank you for filling this. I will ping interested stakeholders & historical, related threads:

• Allow and deny lists for CIDs js-ipfs#2152
• Implement Allow Lists and Block Lists notes#284
  • gateway limitations kubo#1070
• Murmuration-Labs/Songbird: Decentralized Content Moderation & Assessment Proposal
• IPFS Camp: Do not replicate lists - DNR

[lidel]

Addressed by IPIP-0383 (Compact Denylist Format), merged and published at https://specs.ipfs.tech/compact-denylist-format/
Closing.

ps. this is supported by Kubo natively:
https://github.com/ipfs/kubo/blob/master/docs/content-blocking.md