New command to list application images

[rumpl]

For now we show the reference, name and version.

- What I did

Added a new management command image and a subcommand ls (or list)

- How I did it

Some of the code is from this branch made by Silvin, added some more unit and e2e tests.

- How to verify it

• Bundle an app: docker app bundle myapp.dockerapp --tag myapp
• Run docker app image ls

And you should see the application

- Description for the changelog New subcommand docker app image ls to list docker applications that are in the local bundle store.

- A picture of a cute animal (not mandatory but encouraged)

[codecov[bot]]

Codecov Report

:exclamation: No coverage uploaded for pull request base (master@695509b). Click here to learn what that means. The diff coverage is 78.44%.

@@            Coverage Diff            @@
##             master     #639   +/-   ##
=========================================
  Coverage          ?   72.12%           
=========================================
  Files             ?       51           
  Lines             ?     2665           
  Branches          ?        0           
=========================================
  Hits              ?     1922           
  Misses            ?      502           
  Partials          ?      241

Impacted Files	Coverage Δ
internal/commands/root.go	69.3% <100%> (ø)
internal/commands/image/command.go	100% <100%> (ø)
internal/store/bundle.go	68.81% <68.75%> (ø)
internal/commands/image/list.go	83.6% <83.6%> (ø)

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[jcsirot]

LGTM but I think we should wait for #635 to be merged and then rebase this PR.