Implement a JGIS workflow to streamline the "QGIS bounce" pattern

[mfisher87]

A common pattern for geospatial practitioners is to check results at each step of an analysis using QGIS:

1. Change the analysis
2. Write out a data file
3. Copy the dataset from cloud environment, e.g. JupyterHub (unless working locally)
4. Open QGIS
5. Create a new project
6. Add a basemap
7. Add data from (2) to QGIS project
8. Check the data
9. Repeat from 1

This should be achievable with JGIS instead with significantly fewer steps. Our first iteration might look like:

1. Change the analysis
2. Write out the data
3. Pass the data to JGIS with one line of code, e.g. from jupytergis_lab import geo_debug; geo_debug("my_data.tif")
4. Check the data in JGIS (e.g. in a sidecar/tab/split view panel)
5. Repeat from 1

We could do even better eventually, making this process (close to?) frictionless:

1. Change the analysis
2. Pass the data to JGIS with one line of code, e.g. from jupytergis_lab import geo_debug; geo_debug(my_geodataframe) (or my_data_array, or ...)
3. Check the data in JGIS (e.g. in a sidecar/tab/split view panel)
4. Repeat from 1

[mfisher87]

So far, looks like so:

jgis_bounce_demo2_cropped.mp4

Some problems:

1. The sidecar uses the right panel, so we can't see identified features at the same time as the map. I'd like to use a real JupyterLab panel instead of sidecar.
2. Implicitly creates a file debug.jgis. I'd like the JGIS project to be ephemeral by default, and only saved if the user decides to.
3. Every time geo_debug is called, it adds a basemap and the requested layer to the project; should be a new project every time.
4. Don't want to require the user to write out a file; this should be a one-liner passing in a geodataframe.

[mfisher87]

The sidecar uses the right panel, so we can't see identified features at the same time as the map. I'd like to use a real JupyterLab panel instead of sidecar.

This sounds valuable for many use cases. Especially thinking forward to #569. This has been discussed since 2018, but seems to have died down in 2021. Perhaps we can revive the discussion and perhaps implement a system for opening new UI elements from JS/Python.

jupyterlab/jupyterlab#3692
jupyterlab/jupyterlab#4080

[mfisher87]

Sidecar has had this feature since just after those threads died down. Requested they be closed as resolved. I was able to use it PR #340 to open JGIS in a full-fledged JupyterLab "window" (Sidecar(anchor="split-right")).