OCSP Response Builder

[jackenbaer]

Creating an OCSP Response seems to require unnecessary verbose objects "issuer" and "cert" in add_response.
I guess the Serial Number, IssuerNameHash and IssuerKeyHash would be enough.
This change would simplify the implementation of OCSP responders and align better with scenarios where responders operate based on limited certificate information.

[alex]

We previously added https://cryptography.io/en/latest/x509/ocsp/#cryptography.x509.ocsp.OCSPRequestBuilder.add_certificate_by_hash on OCSP requests. We'd be ok adding an analogous API on responses.

Are you interested in submitting a PR?

[jackenbaer]

Ah, yes ! Exactly this for responses.
Yes, I will look into this !