Prototype for "norma image" to manage client docker images

[rpl-ffl]

Usage:

• build/norma image build -c main to create sonic image using main branch
• build/norma image build -c <hash> to create sonic image using commit hash
• build/norma image build -s <scenario-file> to create all sonic images referenced within the scenario file. Default version is main
• build/norma image purge <-f> to purge all sonic images
• build/norma image ls to list all sonic images built currently

This prototype helps to facilitate scenarios where multiple client version is simulated concurrently.

[rpl-ffl]

some test hard code image to sonic:latest, the current build uses the branch name as identifier so it's sonic:main. This must be reconciled.

Done

[rpl-ffl]

Converted to draft as discussed. Current status: PR works, but without buildkit when building docker image. This results in ~10 minutes each time a docker image is built. This should be solved before merging into main.