DPoP usage with ID Tokens

[elf-pavlik]

This is one of the issues raised in a conversation with @dteleguin

https://datatracker.ietf.org/doc/html/draft-ietf-oauth-dpop

DPoP spec talks explicitly about binding Access Tokens. Solid-OIDC only uses

• 4. DPoP Proof JWTs
• 6.1. JWK Thumbprint Confirmation Method

Since access tokens themselves are out of scope for Solid-OIDC.

We should double-check if there are any possible issues of using DPoP Proof JWT with ID TOken