File/folder versioning

[RubenKelevra]

There's been a long ongoing discussion to add versioning to IPFS, this is the feature request keep track of the progress to add file/folder versioning.

As mentioned on the notes ticket we could add optional binary patches with zstd, which would enable us save just the backward facing diffs and the newest version of a file.

Folders could be diffed as well, which obviously makes sense on very large folders, but not sure how this would conflict with sharding.

[Stebalien]

The go-ipfs issue tracker tracks issues/features of the go implementation, not protocol changes. This feature will need a concrete proposal and consensus to proceed.

Honestly, it's probably blocked on better IPLD tooling (in go-ipfs, at least) and finally landing UnixFSv2.

[RubenKelevra]

Okay :)