add id token to grouper ui oidc authn

graeme varga is requesting for entra id using authorization coce flow, decode the id token, and take an arbitrary claim (e.g. employeeID) and use that as a subject identifier or id.

oidc userinfo

• access token back from authn, make call to userinfo endpoint

authorization code flow

• id token jwt

oidc debugger.com

• uri is from idp
• client id from idp (entra id)
• openid scope
• implicit flow

• id token (jwt)
  payload: employeeID

Note to update: https://spaces.at.internet2.edu/display/Grouper/OIDC+authentication+to+Grouper+UI