test creation of icechunks for copernicus data

[eeholmes]

This works

!curl -v -r 0-1023 -o /tmp/test.nc.part \
  "https://s3.waw3-1.cloudferro.com/mdl-native-16/native/OCEANCOLOUR_GLO_BGC_L3_MY_009_103/cmems_obs-oc_glo_bgc-plankton_my_l3-multi-4km_P1D_202603/2024/07/20240702_cmems_obs-oc_glo_bgc-plankton_my_l3-multi-4km_P1D.nc?x-cop-client=copernicus-marine-toolbox&x-cop-client-version=2.2.5&x-cop-user=eeholmes"

and I can get s3 urls like this

!copernicusmarine get \
  --dataset-id cmems_obs-oc_glo_bgc-plankton_my_l3-multi-4km_P1D \
  --dataset-version 202603 \
  --filter "*20240702*.nc" \
  --create-file-list globcolour_files.txt

Task:

• using pace-chl-icechunk-sc.ipynb as an example of creatign an icechunk that uses data in object storage, create a MINIMAL example of an icechunk that uses Copernicus S3 data
• Do not hard code in my username eeholmes. User will provide their own when accessing the data.