feat(oid4vci): rich authorization requests

[TimoGlastra]

Made a start at rich authorization requests for OpenID4VCI:

• models for token request, token response, authorization request, authorization challenge request
• additional validations for RAR
• parsing RAR for OID4VCI server side
• using RAR for OID4VCI on holder side

I think similar to what we have done with scope, requiring the user of this library to actually provide the scope, we should require the user to pass the authorization_details. However like we did with scope, we can create utils. Currently we have an util to extract for a set of credential configuration ids. We should create a combined method:

• if scope -> use the scope
• if no scope and issuer supports RAR type openid_credential -> use RAR
• else throw error

This sill allows full control, while also accomodating the standard flow

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