[EOEPCA/DataAccess] Add zarr conventions to zarr stores in eoap/zarr-cloud-native-format

[fabricebrito]

• Add the zarr conventions to the results produced by the eoap/zarr-cloud-native-format module
  • https://github.com/zarr-conventions/multiscales
  • https://github.com/zarr-conventions/geo-proj
• Verify the alignment with the geo-zarr minispec defined here: https://eopf-explorer.github.io/data-model/geozarr-minispec/