Launch Cogment-Verse from Docker

[wduguay-air]

Changes

• Dockerfile to build image necessary to run cogment verse
• Docker compose file to separate mlflow and cogment-verse services.
• It was necessary to override the orchestrator's web_endpoint port from the hydra config, since it needs be exposed by the container. To set the port from the docker-compose.yaml, before the services are launched, it has to override the hydra config.
• Possible to specify experiment configs from the EXP env variable.

[cloderic]

LGTM