switch to jupyter_events

[Zsailer]

Replaces jupyter_telemetry with jupyter_events.

Telemetry is a more specific use case of the Jupyter Event System mentioned in #780, and it brings some extra constraints that won't be addressed by the (currently available) "event system" use-case. Telemetry might be added to Jupyter Server at a later time.

[codecov-commenter]

Codecov Report

Merging #862 (0028483) into main (0028483) will not change coverage.
The diff coverage is n/a.

❗ Current head 0028483 differs from pull request most recent head 2f7ef4b. Consider uploading reports for the commit 2f7ef4b to get more accurate results

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  Files          65       65           
  Lines        8044     8044           
  Branches     1343     1343           
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  Hits         5802     5802           
  Misses       1836     1836           
  Partials      406      406           

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[Zsailer]

@3coins and @kiendang—pinging you to let you know I've move most of the event handling logic from jupyter_telemetry into jupyter_events. We can start to deprecate these things in jupyter_telemetry.

[Zsailer]

@jupyter-server/jupyter-server-council this should be ready to go. Would someone mind reviewing+merging?

[blink1073]

Are we not renaming "categories" first?

[Zsailer]

Ah, right. Yeah, let's settle that in jupyter_events before merging here. Thanks, @blink1073! I'll open a PR there later today.

[dlqqq]

Looks good! The changes are pretty lean, so I say we can just merge this after the pipeline passes.

Took a quick look at the failing tests here: https://github.com/jupyter-server/jupyter_server/runs/8020778443?check_suite_focus=true. It looks like there's an error when trying to dereference __class__.__name__. Likely something wrong with the test fixtures?

[dlqqq]

@Zsailer BTW, have we established a convention for where to place event schemas within the jupyter_server project? I was thinking just under /jupyter_server/schemas. Could you also paste the Contents Manager event schema you showed off during contributing hour into a Github Gist as an example for developers to refer to?