Solid OIDC Client Browser

This library implements a very simple version of the Solid OIDC protocol:

• AuthorizationCodeGrant
• with PKCE
• with iss check (TODO double check if necessary to check token iss as well)
• with dynamic client registration (TODO support provided client_id and client profile documents)
• RefreshTokenGrant to renew a session
• Unsure about storage. Currently, client_id, client_secret, refresh_token and token_endpoint are stored in sessionStorage. I see that other implementations store the session state in localStorage - no idea if that is deemed secure nowadays.

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Initial version co-authored by @dschraudner and @uvdsl for the MANDAT project, and first released by DATEV Research.