Add OpenID Connect strategy for NFDI #119
Description
Required for NFDI to connect to https://doc.nfdi-aai.de/infraproxy/.
See https://www.passportjs.org/packages/passport-openidconnect/ and https://www.passportjs.org/packages/openid-client/ for libraries to implement. Likely requires extension of the UI as well so users can check what personal information is stored in login server. (see Infrastructure Attribute Policy (IAP) at https://doc.nfdi-aai.de/policies/#nfdi-policies).