When a docker installation is detected on the system, allow to directly spin up a new mongoDB in docker and connect to it.

When that option is chosen automatically create a new container with the mongodb:latest docker image, a fixed username (e.g. "dev") and a random 16 chars password
When the port 27017 is already in use, ask the user which port the container should bind.
Then add the connection to the connections list, connect immediately and open the connection's tree item first hierarchy so I can start adding a database on the server

I want to be able to set up a DB for testing quickly

This is the same feature request I posted on Github: https://github.com/mongodb-js/vscode/issues/570