[deps] add rust-crypto crate (used by ECDSA test harness)

[RyanTorok]

This PR adds the rust-crypto crate as a dependency. It is currently used to implement the host-side hashing operation for the ECDSA Verify tests (see #20853), and will soon be used to test the Sign operation as well by performing the verify operation on the host-side.

[cfrantz]

FYI @pamaury Was going to investigate adding some ecdsa commands to opentitantool for host-side keygen/sign/verify operations.

Make sure you both coordinate so we don't duplicate work.

[RyanTorok]

Rebased to master to run remaining CI checks

[github-actions]

Backport failed for earlgrey_es_sival, because it was unable to cherry-pick the commit(s).

Please cherry-pick the changes locally and resolve any conflicts.

git fetch origin earlgrey_es_sival
git worktree add -d .worktree/backport-21112-to-earlgrey_es_sival origin/earlgrey_es_sival
cd .worktree/backport-21112-to-earlgrey_es_sival
git switch --create backport-21112-to-earlgrey_es_sival
git cherry-pick -x 5a2b250801b5fe781486ce5d47068c2ba3c15c0f