Authentication flow: pubkey from DID and/or PID

[andrea-dintino]

Currently, the pk of the holder, in the authentication flow, is retrieved from the DID:

https://github.com/dyne/slangroom/blob/main/pkg/oauth/src/authenticateHandler.ts#L105-L112

In order to be compatible with EUDI-ARF (probably) the pk needs to be retrieved from the PID. We need to verify this, if correct we need to manage ALSO this possibility.

Tasks

Beta Give feedback

1. Verify EUDI-ARF requirements
2. Implement API with extra parameters, to support pk from DID and PID