Beefy client generic on aduthority Id (#1816)
Revived version of https://github.com/paritytech/substrate/pull/13311 . Except Signature is not generic and is dictated by AuthorityId. --------- Co-authored-by: Davide Galassi <[email protected]> Co-authored-by: Robert Hambrock <[email protected]> Co-authored-by: Adrian Catangiu <[email protected]>