Authentication: Solid-OIDC support #3

Background:

• The Solid ecosystem initially relied on WebID-TLS for authenticated resource access [WEBID-TLS]. The current recommendation for authentication relies on Solid-OIDC (Solid-OIDC).
• ESS/CSS supports Solid-OIDC
• NSS seems to have an issue with OIDC

AS-IS:

• solid-file-python supports only classical username/password authentication

TO-BE:

• Support Web-OIDC authentication and compatible with ESS/CSS.

Reference

• https://github.com/solid/solid-spec#authentication
• https://solid.github.io/solid-oidc/primer/
• https://github.com/solid/webid-oidc-spec