Docker-services-cli

- Adds back support for Python 3.6

- Adds OpenSearch v2

- Adds OpenSearch v1
- Removes Elasticsearch 6

- Upgrades Redis and MQ to latest version
- Supports min version of Python to 3.7
- Formats code with Black

- Removes upper bound on Click which causes projects where docker-services-cli
is installed to limit Celery to v5.1.x because Celery v5.2 requires Click 8+.

- Changes default version of Postgres to v12.
- Adds Postgres v14 and upgrades other versions.