Update list view to show both jobs and job definitions

[ellisonbg]

Problem

We are currently in the process of adding the ability for users to run jobs automatically on a schedule. This issue is to describe and track work needed to enable scheduling on the job list view. Users stories include:

"As a user, I would like to view and manage both jobs and job definitions"

Proposed Solution

• Add an MUI Tabs component to the list view, with two tabs, one for "Jobs" and one for "Job Definitions". The "Jobs" tab should have the existing job table.
• Add a "Job Definitions" table to the appropriate tab in the list view. Will need to work out the exact columns and actions needed for the table.
• Wire the tab to the listJobsView model property here (https://github.com/jupyter-server/jupyter-scheduler/blob/main/src/model.ts#L93)

Additional context

See issue #80 for parallel work on create view.

[ellisonbg]

Here is a tentative list of columns for the "Job Definitions" table

• Name
• Link to open the Job Definition detail view.
• Link to open the Jobs list view filtered for that Job Definition.
• Date/time of last run.
• Paused or not?
• Summary of schedule (this will be challenging, so maybe not in the first round
• Actions:
  • Delete
  • Pause/unpause