implement read_array and write_array to work with netCDF

[bruvio]

• Implement read_array and write_array functions in Python
  analogous to those currently in R (links below) but working with
  netCDF, not HDF5.
• Generate an example netCDF file using these.
• Ensure config files work with the new code.

R HDF5 functions:

https://github.com/FAIRDataPipeline/rDataPipeline/blob/main/R/read_array.R
https://github.com/FAIRDataPipeline/rDataPipeline/blob/main/R/write_array.R

May also be useful:

https://github.com/dezed-ukaea/netcdf-example/blob/master/netcdf_write.py