feat: add bind and compose mount settings for superset

[pomegranited]

Description

Adds IMAGES_BUILD_MOUNTS and COMPOSE_MOUNTS support for development on Superset within Aspects.

Preliminary step to work on openedx/openedx-aspects#299

Testing instructions

1. Install this plugin's branch to your tutor virtualenv.
2. Clone the Superset repo to your local environment: git clone https://github.com/apache/superset.git
3. Add a mount for where you cloned superset, e.g. tutor dev mounts add /dev/superset
4. Check that the mount shows up in the list, e.g tutor dev mounts list should have:

   - name: /dev/superset
     build_mounts:
     - image: aspects-superset
       context: superset
     compose_mounts:
     - service: superset
       container_path: /app
   

5. Rebuild your superset image: tutor dev images build aspects-superset
6. Stop superset and run a shell to check that your superset repo is mounted under /app.

[openedx-webhooks]

Thanks for the pull request, @pomegranited!

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[Ian2012]

LGTM, keep in mind that our Dockerfile depends heavily on the already built image of Superset so, changes to requirements or changes of this kind may not be well supported.

Another approach is to updated our Dockerfile to re-use/extend the upstream Dockerfile, however for general Aspects operations will only slow down builds.