New command `certificate view` that decodes any certificate and shows its content on a human readable format.

Similar to `cardano-cli debug transaction view` but for certificates.

It is desirable idea to be able to inspect a CLI-created artifact and verify its content in a human-readable format. i.e. You are an SPO, a multiparty DRep or in general part of a group where you have separations of concerns: i.e. someone creates a certificate for you, and you are in charge of submitting it to the chain, you want to be able to verify that what you are going to append to the transaction coincides with what you are expecting.