Print mrenclave as base58, not hex value

[haerdib]

A registered enclave currently looks like the following:

But to use the mrenclave via CLI, it needs to be base 58 encoded. So why not print it that way right away?

[clangenb]

The issue is that polkadot-js/apps does this automatically for us because the pubkey is defined as an AccountId. Also, is not base58, it is ss58, which includes the chain's specific ss58 in the encoding. I do not know how we could tell polkadot-js that it should be printed bs58-encoded.

But yeah, if there is a simple way to do this, it would be nice.

[haerdib]

Maybe converting it to a string will solve it. But since an AccountId in no_std does not implement the print method, it will be tricky anyway. But I think it should be possible somehow. I hope.