feat(host-contracts): delegate user decrypt

[jatZama]

Closes https://github.com/zama-ai/fhevm-internal/issues/474

[jatZama]

Good work, but I think you forgot to rerun selectors computation in your last commit, since you changed one of the custom errors signatures, right?
Aslo what was the rationale behind renaming NewDelegation event to DelegateAccount? I don't remember any discussion on this topic.

[isaacdecoded]

Good work, but I think you forgot to rerun selectors computation in your last commit, since you changed one of the custom errors signatures, right?

I think the selectors are up-to-date already.

Aslo what was the rationale behind renaming NewDelegation event to DelegateAccount? I don't remember any discussion on this topic.

Basically, to follow the same convention we have been using for others events, I mean, using same/similar name as the contract method that triggers it. E.g., RevokedDelegation for revokeDelegation(), AllowedForDecryption for allowForDecryption() , etc.

[isaacdecoded]

LGTM! 👍