Add support for draft-chen-cfrg-vdaf-pine

[cjpatton]

• [X] Upstream implementation of draft 00.
• [x] Replace VDAF test driver with the new one in the prio crate (with feature "test-utils").
• [x] Plumb into daphne configuration.
• [ ] Update to draft 01 (work-in-progress)
• [ ] Plumb into taskprov.