Add Jupyter notebook widget/dashboard

[JoshKarpel]

Various resources:

https://ipywidgets.readthedocs.io/en/stable/index.html (the standard)

http://panel.pyviz.org/ (new project that might make things easier?)

[JoshKarpel]

https://github.com/krishnan-r/sparkmonitor

[bbockelm]

@elin1231 - as you start to have updated findings on the topic, please drop them into this ticket.

[elin1231]

Jupyter notebook and Jupyter lab are very different in the way extensions are written. Josh suggested Jupyter Lab as the main focus of this project. The following link is the get started guide for sample Jupyter Lab project:

Get Started:
https://github.com/jupyterlab/extension-examples/tree/master/basics/hello-world

This has been especially helpful for this project:
https://github.com/jupyterlab/extension-examples/tree/master/advanced/server-extension

[elin1231]

https://jupyterlab.readthedocs.io/en/stable/developer/extension_dev.html#tokens
A list of tokens that could be used to interact with all elements of jupyter lab.

The naming scheme could be found here:
https://jupyterlab.readthedocs.io/en/stable/user/interface.html

[JoshKarpel]

Most of the notes above are about dashboards, but we should also have rich display on Map objects, which will probably be significantly easier to figure out initially. Here's the docs: https://ipython.readthedocs.io/en/stable/config/integrating.html#rich-display; and an example of how they're used: https://github.com/dask/dask/blob/51d3f1120fc55f21b5ce1ac137201ea01d9cf496/dask/array/core.py#L1251 .

[JoshKarpel]

#230 completes widgets for Map state tracking. Other things that we'd like to do in the future:

• Widget for the htmap.status() table
• Dashboard pane for Jupyter Lab (this would be a full extension)