This resolves the conflicts and gets the workspace `Cargo.toml`s to not be
invalid. It doesn't actually get clippy to pass again yet.
Does move `crypto/dkg/src/evrf` into a new `crypto/dkg/evrf` crate (which does
not yet compile).
It's only there to make the VariantSignid unique across Sessions. By localizing
the VariantSignid to a Session, we avoid this, and can better ensure we don't
queue work for historic sessions.
Abstract, to be done for the transactions, the batches, the cosigns, the slash
reports, everything. It has a minimal API itself, intending to be as clear as
possible.
