[Feature request / acme4j] Allow to access delegations

[August Johann]

RFC9115 allows a holder of an identifier to delegate certification requests to a third party. This epands the account object with an additional field called delegations. The delegations URL link to delegation lists and in the end to delegation objects.

Please specify a way to access the delegation objects via the acme4j interface.

[Richard Körber]

Thank you! Accepted as enhancement.