Jupyter Server 2.0

[Zsailer]

It looks like the new Identity API might need to introduce some backwards incompatible changes, warranting a new major release of Jupyter Server (i.e. 2.0).

I am opening this issue for two reasons:

1. make everyone aware of this change to avoid inadvertently publishing this feature in a 1.x release.
2. discuss a strategy for branching and releasing going forward.

I'll do some poking around other Jupyter subprojects to see how these things are managed elsewhere. In the meantime, if anyone wants to provide their own insights, feel free to comment below.

Thanks!

[blink1073]

I created a 2.0 milestone and also added jupyter-server/jupyter_server#651

[echarles]

Replying here on comment from @fcollonval #15 (comment)

Is needed for JupyterLab 4.0, i.e. before June? No.

I disagree on that point. Identity is needed for RTC and we certainly hope to get a first decent RTC experience in 4.0.

I am +0.5 :) on @fcollonval comment. There are other features needed to bring that decent RTC experience in 4.0. :)

As the identity API is a needed building block for RTC, I agree jlab-4 depending on jserver-2 would be a good fit.

[vidartf]

We're well on the way to a 2.0 release, so I think we have resolved the points brought up in the issue.