Draft: Add support for Teku validator.

teku keystore generation - change entrypoint do what's necessary and delegate back
teku default fee recipient address - get from docker-compose.yml as defined in BN
teku metrics port - set 8081 as defined in prometheus scrape config file
reloader - add fallback for obtaining validator api auth token ; move w3skeys.json to /tmp/ so container can run as non-root user

new version of reloader container has to published prior to merge and .env file updated pointing to the new version

shamirlabs / diva-alpha-net