Moving Jupyter Hub support to a separate extension

[rebornix]

Currently we support an old version of Jupyter Hub but not the latest. With the introduction of stable api, we could move the Jupyter Hub support to a separate extension, which can potentially get community help for supporting all versions of Jupyter Hub.

Tasks

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1. Verify server is already running (before starting a kernel or testing the connection)
2. Migrate existing connections
3. Store base URL and not full url in global storage
4. Test to verify we can start a kernel with the Auth information (enumerating kernels via API is not sufficient)
5. Store username/password
6. Prompt for username/password or a Token (token might work in web)
7. Create Repo, setup Pre-release & release pipelines, CG, etc
8. After trying that in the browser, I figured this out as in the browser it's a 5xx error. It would be great if the error message we present is more accurate but I guess it's a corner case as usually users already have jupyter hub running successfully. See Plan for moving Jupyter Hub support to a separate extension #14202 (comment)

[DonJayamanne]

Marking as completed