implement datashader plotting for high-resolution datasets

[iluise]

Describe the task. It can be a feature, documentation, etc.

this option is useful to plot high resolution datasets with millions of points, like e.g. era5 n320, the GEOS, CERRA etc..

it is implemented as an additional option:

global_plotting_options:
...
  ERA5:
    use_datashader: true
    ...

the default option will remain matplotlib and ax.scatter

Hedgedoc URL, if you are keeping notes, plots, logs in hedgedoc.

No response

Area

• datasets, data readers, data preparation and transfer
• model
• science
• infrastructure and engineering
• evaluation, export and visualization
• documentation
• performance