Data Format Stability Tasks

[matheus23]

• [x] Review of https://github.com/wnfs-wg/rs-wnfs/pull/247 & merge
• [x] XChaCha-Poly1305 instead of AES-GCM https://github.com/wnfs-wg/rs-wnfs/pull/305
• [x] Blake3 instead of SHA3 https://github.com/wnfs-wg/rs-wnfs/pull/306
• [x] golden snapshot tests to make sure we won't break the data format in future wnfs updates https://github.com/wnfs-wg/rs-wnfs/pull/314
• [x] "release candidate" phase: we'll take a closer look at all of the data that rs-wnfs generates and see if all of its pieces are specified/adhering to the spec
• [ ] mark the release candidate as final

ETA: 2023-09-30

[expede]

AKA "the road to 1.0-RC" 🚀