[suggestion] Adopt multihash format for private keys

[0x009922]

In configurations, we use the following format for public/private keys:

public_key = "ed012014A2900349A8CB6250D8CE5399D1964766B559A37F48E8C98C1EA83F365D8A72"
private_key = { algorithm = "ed25519", payload = "67AAB998A3951A071324B815BAF425309D6AF8D2D2636A3FC2BEA01C322BC23B14A2900349A8CB6250D8CE5399D1964766B559A37F48E8C98C1EA83F365D8A72" }

While multihash format is used for public_key, why can't we use it for the private one too?

It would make config more consistent and less confusing, and will also remove necessity to set private key in the environment through 2 split variables PRIVATE_KEY_ALGORITHM and PRIVATE_KEY_PAYLOAD.

[Erigara]

Sounds good to me, what are downsides?

[DCNick3]

Same position here. Sounds good and doesn't seem to have any downsides on the first glance.