Earthkit-data

See: https://earthkit-data.readthedocs.io/en/latest/release_notes/version_0.2_updates.html

Missed tranform function in 0.0.3b0 release

Specific file names and wildcards can now be included/excluded when opening ZIP files:
python
data_1 = emohawk.open("my_file.zip", include="*.nc") Only unzip and open files ending in ".nc"
data_2 = emohawk.open("my_file.zip", exclude=("*.png", "*.json")) Ignore PNG and JSON files

- cgul harmonisation included when converting to xarray
- notebook examples added