useDPoP Ignored in OpenID4VCI Library

[craigaps]

When defining the configuration for a wallet, there is an option to set the useDPoP, granted when not provided the default is false. However regardless of this value, it's not passed down into the OpenID4VCI library.

A dpopConstructor is assigned in the OpenId4VCIService.getIssuer function using the data from offer.authorizationServerMetadata.dpopSigningAlgValuesSupported with no ability to set the dpopConstructor to nil avoiding the DPoP JWT in AuthorizationServerClient.submitPushedAuthorizationRequest - in particular in the OpenID4VCI:

AuthorizationServerClient.swift line 332

let tokenHeaders = try await tokenEndPointHeaders(
  url: parEndpoint,
  dpopNonce: dpopNonce
)

Needs to be a way to avoid using DPoP where if the server is not configured for it despite supplying metadata in the .well-known/oauth-authorization-server dpop_signing_alg_values_supported element.

Also, honouring useDPoP it would also leave the token type to Bearer