[cappuccino milestone] VID tech debt

[ggutoski]

This repo

• [priority code clean-up] VID namespace use new hotshot BlockPayload API #856
• [priority code clean-up] Split block2.rs into multiple files #951
• Payload redesign #1012
• Follow-up refactoring of Payload #1076
• VID-namespace error handling should be pure-anyhow #1040
• [TECH_DEBT] - Proper VidScheme constructor HotShot#2659
• Proper VidScheme constructor shared with hotshot #1047

Jellyfish

• Ergonomic conversion of HasherNode to byte slice jellyfish#471
• ADVZ constructor that allows jellyfish to select multiplicity for the caller jellyfish#463