IATP: create model classes and transformers

[paullatzelsperger]

Feature Request

This issue is intended as preparatory work for the IATP implementations, it calls for the implementation of the following model classes:

• VerifiableCredential
• VerifiablePresentation

these go into an SPI module together with the interfaces.

Other objects we need beforehand include JSON-LD transformers, which should go in a separate module.

Which Areas Would Be Affected?

iam

Why Is the Feature Desired?

IATP adoption

Solution Proposal

If possible, provide a (brief!) solution proposal.

[paullatzelsperger]

upon closer investigation, it turns out we don't actually need transformers for VCs and VPs, because we also have to be able to work with JWTs.

In addition, when using JSON-LD, all verification and creation (of VPs) is done by the CryptoSuite, and that is done completely self-contained and transparently.

What we will eventually need is something like an "extractor", that expands the VP/VC and extracts information out of it, to populate the model class (VerifiableCredential|Presentation).