Make sure client instance has been authorized and started before allowing requests

[allburov]

From https://github.com/devlikeapro/whatsapp-http-api/issues/37#issuecomment-1363933187

To resolve this issue, it is recommended to ensure that the webhooks are fully initialized on the server before making the endpoints available for the , in order to avoid the freeze in the docker container.

No requests are allowed (except qr screenshot) to the session till it has been authorized and fully configured