Resolve "&namnc4 ! netcdf4 chunking and compression settings : set netcdf4 mandatory and rm key_netcdf4 + default chunking only ?"

Pierre Mathiotrequested to merge
183-namnc4-netcdf4-chunking-and-compression-settings-set-netcdf4-mandatory-and-rm-key_netcdf4 into main

Closes #183 (closed)

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