add CLC Alps eodc backend

[ValentinaHutter]

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[ValentinaHutter]

@clausmichele is it okay if I put the notebook under /tutorial/part2 as well?

[jdries]

@ValentinaHutter for me, the notebook would make more sense if it actually also shows how to compute the difference between timestamps in openEO. Meaning, it's not that it's not allowed to compute the difference locally, but doing so in an openEO notebook could be misinterpreted as not being able to do it in openEO.

[clausmichele]

@ValentinaHutter I also updated the client side version here: https://github.com/pangeo-data/pangeo-openeo-BiDS-2023/blob/main/tutorial/part2/openEO%20-%20Client%20Side%20Land%20Cover%20Alps.ipynb

I compute the difference in openEO. For my notebook, it's necessary to merge the drop_dimension fix PR here: Open-EO/openeo-processes-dask#188
and if possible also the merge_cubes fix here (but works as well setting the band dimension to "bands"): Open-EO/openeo-processes-dask#166