NewClientApp will register the ArgoCD client app in Dex and return an object which has HTTP handlers for handling the HTTP responses for login and callback.

NewDexHTTPReverseProxy returns a reverse proxy to the DEX server.

DexgRPCAPIAddr is the address to the Dex gRPC API server for managing dex.

DexReverseProxyAddr is the address of the Dex OIDC server, which we run a reverse proxy against.