Provide IStateDB in retro

[jtpio]

References

To address the jupyterlab-tour part of #286

Code changes

Add @jupyterlab/apputils-extension:settings to the retro app.

User-facing changes

Users should be able to take tours with RetroLab if the jupyterlab-tour extension is installed and tour exists.

Backwards-incompatible changes

None

[jtpio]

So this seems to fix it, although the existing tours are not usable:

[bollwyvl]

Notebook tour works like a frigging champ:

[jtpio]

Notebook tour works like a frigging champ:

Ah right there is one for the notebook, great!

[bollwyvl]

Unfortunately, the notebook and main tours are bundled together as a single plugin 😿

Our boring custom tour uses jp-JupyterLogo to fire it up, so that could probably be fixed, e.g. #jp-JupyterLogo, #jp-RetroLogo... should only be one on the page at a time... though there's probably enough stuff that's different to warrant multiple ones, scoped to each app's folder

[jtpio]

Unfortunately, the notebook and main tours are bundled together as a single plugin crying_cat_face

Sounds like we could split them into multiple plugins upstream? Which should make it easier to disable / enable here.

[jtpio]

So this should then be good to go!

We can iterate on the tours separately.

[jtpio]

Sounds like we could split them into multiple plugins upstream?

Opened jupyterlab-contrib/jupyterlab-tour#40 to discuss.