Create Data Exploration notebook for radar data

[stevehadd]

Create a dataset exploration notebook for radar data

Prepcip rediagnosis repo contains useful into for extracting radar data.

https://github.com/MetOffice/precip_rediagnosis

Use config file like
https://github.com/MetOffice/precip_rediagnosis/blob/main/cfg/event_configs/2020_storm_ciara.json

with the run data prep script:
https://github.com/MetOffice/precip_rediagnosis/blob/main/util/run_data_prep_spice.sh

most important is mass path to radar data
"moose:/adhoc/projects/radar_archive/data/comp/products/composites/

Data is organised in tar files per day