feat: add new notebooks endpoints for new amalthea version

[olevski]

@andre-code let me know what you think.

[andre-code]

Thanks @olevski for including those changes. I checked what we currently use and found the following:

• Does "running degraded" mean the session is stopping? What are the statuses for starting and stopping?

• We use detailsand message for the start session progress bar and the session status popover, the rest isn't used in v2.:

{
    "details": [
        {"status": "waiting", "step": "Initialization"},
        {"status": "waiting", "step": "Downloading server image"},
        {"status": "waiting", "step": "Cloning and configuring the repository"},
        {"status": "waiting", "step": "Git credentials services"},
        {"status": "waiting", "step": "Authentication and proxying services"},
        {"status": "waiting", "step": "Auxiliary session services"},
        {"status": "waiting", "step": "Starting session"}
    ],
    "message": "Steps with non-ready statuses: initialization, downloading server image, cloning and configuring the repository, git credentials services, authentication and proxying services, auxiliary session services, starting session.",
    "readyNumContainers": 0,
    "state": "starting",
    "totalNumContainers": 7,
    "warnings": []
}

• Can session_launcher_id be null for orphan sessions?

• We show an alert icon when annotations.default_image_used is set and the session is running. Do you know if this is needed, and why?

• Is created_at the same as started?

• We use session.url to offer an "open in new tab" option, but it seems missing.

• We show session.resources.request for resource changes when hibernating. The resource_class_id could no exist anymore and we lose that info

• The schema for launching a session isn’t clear on sending more info than cloud storage IDs:

  • Can we send credentials?
  • Can we overwrite environment_variables?
  • What are the new values? the ones included in the jupyter free pitch