T3: [TODO merge with parent issue] Consensus VID integration macro task

[ggutoski]

Why?

Currently VID work is split between the transactions task and the DA task, neither of which were intended for VID. If we continue to develop VID in this way then those two tasks will become an unholy mess. We need a separate VID task.

Currently VID does not have its own exchange. Instead we are re-using quorum exchange (in transactions task, pending #1864) and committee exchange (in DA task). But these exchanges were not intended for VID. Example: quorum exchange has a bunch of methods that are consensus-specific. (eg create_yes_message, create_no_message, create_timeout_message, etc.) Moreover, whichever exchange VID uses will need to offer some VID-specific methods. (eg create_vid_message, sign_vid_vote, etc). Currently these VID-specific methods have been added to the committee exchange. (Ugly!) But, as we know, VID should not use committee exchange in the future, so these VID-specific methods must be moved somewhere else eventually.

Subtasks

• New task + exchange for VID. (Not sure yet how to divide this subtask.) T3.1: New task + exchange for VID #1905 1905
• New event TransactionsReady, publish VidDisperseSend inside VID task: New event TransactionsSequenced, publish VidDisperseSend inside VID task #1817 (comment)

Old related issues?

Old issues. Not sure how relevant they still are.

• Store both VID and DA cert types in consensus #1701
• New type for VidVote? #1703
• New type for VidCertificate? #1716

[ggutoski]

This issue is subsumed by #1583