cesium.rs

* Added support to show g1v1 base58 public key from (ed25519) ss58 address, AccountId, ed25519::Public with tests for those
* Renamed SecretFormat.Cesium to SecretFormat.G1v1
   * Adapted `clap` display help to reflect the change
   * Still supporting using "cesium" as "-S" secret format argument and mapping it to SecretFormat.G1v1
* Adapted display of vault
   * Changed column "Format" into "Crypto", showing either "ed25519" or "sr25519" instead of "cesium" or "substrate"
   * Adapted 1st row header to "SS58 Address/G1v1 public key"
   * For "ed25519" account, showing a 2nd row just below containing "└ G1v1: <base58 public key value>"
   * Adapted test cases and added a G1v1 account example
* Adapted (String) Display of vault_account to include "g1v1_pub_key" value when crypto_scheme is Ed25519