Django-Solid-OIDC-Provider

EDIT: this issue originally focussed on consolidating parts of DjangoLDP-Account's functionality into Django-WebID-OIDC-Provider. This I think is covered by #5 so now the scope of the issue can be relating to the changes in the Solid OIDC specification from the older WebID OIDC specification

See #6 (closed) for background and a comparison of the two specifications

Without further ado here are the tasks I think will be involved in the upgrade:

• DPoP (OP-side #1 (closed) , RS-side djangoldp-account#70 (closed))
• Client identifiers as URI (#10 )
• code_challenge_methods_supported key should be returned in ProviderInfoView response (optional)
• Implicit grant type support dropped for security reasons
• user's webid is stored on client, but since we store the user, who should have a webid, this may be implicit
• access token fields. Being covered in the work on DPoP
• webid in id_token. Being covered in the work on DPoP
• MUST advertise solid-oidc conformance in OIDC discovery
• included missing RS-side steps in djangoldp-account#70 (closed)