Bridge to other tests types like W3C test suite to take advantage of AATH reporting

[nodlesh]

Adding 2 or 3 routes to existing backchannel.

New feature file about issueing and proving W3C creds.

Point the backchannel to one of their implementations.

https://w3c.github.io/vc-di-eddsa-test-suite/

https://w3c.github.io/vc-data-model-2.0-test-suite/