Support ed25519 for agent keys

[alanshaw]

We currently use RSA keys for agent identities in the browser. At the time ed25519 support was not available in the webcrypto API and as such we could not create keys that were non-extractable that we could store in IndexedDB.

However, support for ed25519 is now widely available and we should switch to using this shorter and faster key.

Essentially this line

upload-service/packages/w3up-client/src/index.js

Line 43 in 3e0537d

const principal = options.principal ?? (await generate())

needs to switch to using a webcrypto ed25519 non-extractable key implementation.

This will mostly involve work in Ucanto, specifically @ucanto/principal to either add new principal type, or adapt the existing ed25519 principal to use web crypto instead of @noble/ed25519. I would prefer the latter, unless it is a significant blocker.

[ChayanDass]

@Dhruv-Varshney-developer …. i’d like to work on this. could you assign me this issue?

[NiKrause]

I have done some work here already and would like to contribute too.
Edit: @ChayanDass I am starting work on that issue since of our conversation before and ok from @alanshaw

[NiKrause]

Please see two PRs @alanshaw