Merge #4048 #4137

4048: Expose Key interface in Cardano.Api.Shelley r=ch1bo a=ch1bo

Sorry for this unsolicited PR, it is *not* crucial for us, but we wanted to get also your feedback on:

In the Hydra project we are using the cardano-api quite heavily and thought we could distinguish Hydra key types using the same framework, but just with a new `Hydra` key role. 

Unfortunately it was not possible because some of the type class definition was not exported.

This PR exposes the full type class to be able to define instances of it and having a `Hydra` key role, this yields `SigningKey Hydra` and `VerificationKey Hydra` key types.

See also this PR: cardano-scaling/hydra#398

4137: Give myself and John permission to merge any PR r=Jimbo4350 a=Jimbo4350



Co-authored-by: Sebastian Nagel <sebastian.nagel@ncoding.at>
Co-authored-by: Jordan Millar <jordan.millar@iohk.io>

src/Cardano/CLI/Byron/Run.hs

@@ -21,7 +21,7 @@ import qualified Cardano.Crypto.Hashing as Crypto
 import qualified Cardano.Crypto.Signing as Crypto
 
 import           Cardano.Api hiding (UpdateProposal, GenesisParameters)
-import           Cardano.Api.Byron (SomeByronSigningKey (..), Tx (..), VerificationKey (..))
+import           Cardano.Api.Byron (SomeByronSigningKey (..), Tx (..))
 
 import           Ouroboros.Consensus.Byron.Ledger (ByronBlock)
 import           Ouroboros.Consensus.Ledger.SupportsMempool (ApplyTxErr)

src/Cardano/CLI/Shelley/Run/Key.hs

@@ -31,7 +31,6 @@ import qualified Cardano.Crypto.Wallet as Crypto
 import qualified Cardano.Ledger.Keys as Shelley
 
 import           Cardano.Api
-import           Cardano.Api.Byron hiding (SomeByronSigningKey (..))
 import qualified Cardano.Api.Byron as ByronApi
 import           Cardano.Api.Crypto.Ed25519Bip32 (xPrvFromBytes)
 import           Cardano.Api.Shelley