Open file picker dialog when loading a variable

[William-Hill]

Is your feature request related to a problem? Please describe.
When loading a variable, the screen is switched to the native Jupyter Lab file explorer with little instruction of what to do next. A user must know to load a .nc file, but it's not intuative

Describe the solution you'd like
Create a modal or file select dialog that only displays .nc files when attempting to load a variable.

Additional context
Add any other context or screenshots about the feature request here.

[William-Hill]

I spoke with one of the JupyterLab developers and there's currently no way to do this. We would have to write the modification to the FileBrowser extension ourselves.

[sterlingbaldwin]

I think this should be closed. "A user must know to load a .nc file, but it's not intuative," the whole point of the project is to open .nc files, I think its not an unfair assumption that users will know to open netCDF files when using a netCDF visualization tool. I mean, it wouldnt be terrible to be able to highlight .nc files or something, but this is a very high effort low reward feature.