support secrets in shared links, add blocklist to authenticator

jsc_custom/apihandler/share_button.py

jsc_custom/authenticator/oauthenticator.py

jsc_custom/handler/share_handler.py

jsc_custom/spawner/api_notifications_sse.py

jsc_custom/spawner/api_spawn_options_update.py

jsc_custom/spawner/spawner.py

jsc_custom/spawner/utils.py