Revisit OAuth 2.0 Client Documentation

[jzheaux]

• add more constants to OAuth2ParameterNames #15130

[BingChunMoLi]

custom AuthorizationRequestRepository

• Document missing OAuth2LoginAuthenticationFilter set AuthorizationRequestRepository

                http.oauth2Client(oauth2 -> oauth2
                        .authorizationCodeGrant(codeGrant -> codeGrant
                                .authorizationRequestRepository(this.authorizationRequestRepository())
                        )
                )
                .oauth2Login(builder -> builder.authorizationEndpoint().authorizationRequestRepository(this.authorizationRequestRepository())).build();

[BingChunMoLi]

Change to lambda

                http.oauth2Client(oauth2 -> oauth2
                        .authorizationCodeGrant(codeGrant -> codeGrant
                                .authorizationRequestRepository(this.authorizationRequestRepository())
                        )
                )
               .oauth2Login(oauth2 -> oauth2
                        .authorizationEndpoint(endpoint-> endpoint
                                .authorizationRequestRepository(this.authorizationRequestRepository())
                        )
                ).build();