Support for did:peer:4

In order to participate in the [DIDComm interop a thon](https://blog.identity.foundation/join-the-didcomm-interop-a-thon) we need support for [did:peer:4](https://identity.foundation/peer-did-method-spec/#method-4-short-form-and-long-form)

We need:
- a resolver in order to accept other DIDs.
We can either:
- integrate with the universal resolver
- build in the dedicated resolver (https://github.com/FabioPinheiro/scala-did/issues/320)
- a db to storage to keep the long/short form of the DIDs
- a new way to setup the DID that support did:peer:4