Define _jupyter_server_extension_paths for backward compatibility

[casparvl]

Also, the __init__.py file used to contain

load_jupyter_server_extension = load_jupyter_server_extension

That doesn't seem to make sense, it's like x = x, that's a no-op. Probably you meant to do what was suggested here https://jupyter-server.readthedocs.io/en/latest/developers/extensions.html#migrating-an-extension-to-use-jupyter-server , also for backward compatibility.

For comparison, see e.g. https://github.com/jupyterhub/jupyter-server-proxy/blob/099fce21feed4c5c762740dea2d34c5ca548c5b3/jupyter_server_proxy/__init__.py#L51

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[casparvl]

Ping on this one: is there anything blocking the merge of this fix?

[jtpio]

Thanks @casparvl this looks good 👍

Waiting for the CI fix to complete in #145. We can then rebase this PR and merge it.

[casparvl]

@jtpio I accidentally removed my fork for this. I saw you rebased my other PR based on #145 . Can you still do the same for thise one so that it can be merged? Or is that impossible now that more fork disappeared? If the 2nd: any suggestion on how we best proceed? It's a one-line change, if needed I can recreate it in a new fork (or you can, whichever you prefer)...

[jtpio]

@casparvl maybe the best would be to create a new branch on your fork with this change, and open a new PR.

[casparvl]

Closing in favour of #148