[WAS] Update WAS QR code to request zcap

[dmitrizagidulin]

Depends on: issue #394

Currently (in draft PR #344), the VPR returned in the vprQuery() function looks like this:

    verifiablePresentationRequest: {
      query: [
        {
          type: 'QueryByExample',
          credentialQuery: {
            reason:
              'Please present your Verifiable Credential to complete the verification process.',
            example: {
              '@context': ['https://www.w3.org/2018/credentials/v1'],
              type: ['VerifiableCredential']
            }
          }
        }
      ]
    }

This was just a placeholder. Task: Update that VPR to request read/write zCaps for the VerifiableCredentials and Documents WAS Collections.

The new VPR should look like this:

    verifiablePresentationRequest: {
      // this is where the response will be sent -- the LC Author polling endpoint
      interact: {
        type: 'UnmediatedHttpPresentationService2021',
        serviceEndpoint: pollingExchangeEndpoint // from PR #344, see below
      },
      // This is the zCap request detailing which permissions the LC Author app wants
      query: [
        {
          type: 'ZcapQuery',
          capabilityQuery: {
            reason:
              'Linked Creds Author is requesting the permission to read and write to the Verifiable Credentials and VC Evidence collections.',
            allowedAction: ['GET', 'PUT', 'POST'],
            controller: appInstanceDid,  // the app's DID string, generated in issue 394. example: 'did:key:.....'
            invocationTarget: [
              { type: 'urn:was:collection', contentType: 'application/vc', name: 'VerifiableCredential collection'},
              { type: 'urn:was:collection', contentType: 'application/octet-stream', name: 'VC Evidence collection' }
            ]
          }
        }
      ]
    }

Note the two variables in the VPR above:

appInstanceDid -- this is going to be the did:key DID of the app, generated in issue #394

pollingExchangeEndpoint -- this is the {url of linked creds author}/api/exchanges/[txId] URL from PR #344. This is where the wallet will POST the resulting zCap to.

[dmitrizagidulin]

(Added interact endpoint section)

[0marSalah]

PR #396

[dmitrizagidulin]

Implemented, closing.