Allow and deny lists for CIDs

[olizilla]

Allow users to configure

• An "allow list" - a list of CIDs they are willing to host or particpate in the discovery of.
• A "deny list" - a list of CIDs they do not want to host or participate in the discovery of.

Meta issue describing the functionality: ipfs/notes#284
Open issue for the same functionality for go-ipfs ipfs/kubo#1070 and a notes issue explaining the scope

[alanshaw]

Notes and slides from Deep Dive at IPFS Camp 2019: https://github.com/ipfs/camp/blob/master/DEEP_DIVES/25-do-not-replicate-lists-dnr.md

[achingbrain]

js-ipfs is being deprecated in favor of Helia. You can #4336 and read the migration guide.

This isn't planned, but you could implement your own blockstore adapter that enforces these lists.