Use jupyterlab + jupyter lab variable explorer as alternative for RStudio

[JohannesWiesner]

When installing R-studio via conda, the R-version gets downgraded to 3.x because the R-Studio from conda is not well maintained. This in consequence leads to to a lot of incompatibilty issues because some packages only work together with R version > 4.x. The current solution is to NOT install Rstudio in the first place but to completely rely on jupyter lab as IDE for R. But for that it would be nice, to get the variable inspector from jupyterlab working, because not having a possibility to inspect the variables sucks.

[JohannesWiesner]

Discovered, that for both jupyter-notebook and jupyter-lab there is a variable inspector and a variable explorer.

For jupyter-notebook there's the variable inspector:

https://stackoverflow.com/a/41338184/8792159
https://jupyter-contrib-nbextensions.readthedocs.io/en/latest/nbextensions/varInspector/README.html?highlight=varinspector

And for jupyter-lab there's this variable explorer:

https://github.com/lckr/jupyterlab-variableInspector

[JohannesWiesner]

It seems that this works fine on Ubuntu, but not on Windows (related to jupyterlab-contrib/jupyterlab-variableInspector#237). Add a new issue and allow users to further specify bug flag. It shoud be possible to specify on which OS certain packages don't work. Depending on the used OS, this will automatically filter for the right packages.