[consensus/marshal] Integrate `commonware-coding` By Default

[patrick-ogrady]

In marshal, we broadcast full blocks to each participant. With the current abstraction interface, I suspect we could integrate commonware-coding with very little changes to the "application".

This would prevent proposer withholding (where the proposer doesn't send a block that is notarized to the next leader) OOB. Not to mention, would make any application more scalable.

[patrick-ogrady]

TL;DR proposer generate chunks for each participant and sends them. When voting, a participant sends their chunk with their notarize/finalize.

If a notarization or finalization is ever recovered, someone must be able to then recover the underlying block.

If the block was not validly encoded, it should be skipped (this is confirmed deterministically during commonware-coding recover).

[patrick-ogrady]

While it may be tempting to push this "chunk" broadcast during vote into consensus, we should refrain to reduce duplication/enforce a particular broadcast scheme.

[patrick-ogrady]

When recovering missing "shards", we should prefer pieces early in the encoding (so we don't have to do any recovery computation).

[patrick-ogrady]

Blocked by #402