[Feature]: document current state of ed25519

[rootulp]

Summary

I'm confused by the current support for ed25519 keys in the Cosmos SDK.

Problem Definition

Based on the line below from the docs, I think I should be able to generate an ed25519 key.

The keyring also supports ed25519 keys, which may be created by passing the --algo ed25519 flag.

But I can't

$ ./build/celestia-appd keys add test --algo ed25519
Error: provided algorithm "ed25519" is not supported

I also found #8543 which makes me think ed25519 is defined but not actually usable. https://github.com/cosmos/cosmos-sdk/blob/main/crypto/keys/ed25519/doc.go doesn't state it's level of support.

Proposal

Document the current state of ed25519 keys in Cosmos SDK. How can apps use them?

[tac0turtle]

ed25519 is not supported today, it lives in the sdk for comet consensus key types. We can add this documentation

[Satchitananda]

Was also confused by doc