fix: introduce create-only-if-needed functions for containers and images

[tippenein]

closes #1455

The main addition here is create_image_if_needed and the container_if_needed is seemingly only needed for postgres. There is a bit of a discrepancy with what to do when we hit already existing containers. Currently it uses it, but alternatively we could drop and recreate for postgres..

this current functionality allows me to clarinet devnet start with wifi off.