Add Julia EOPF examples for Sentinel-2 and Sentinel-3

[felixcremer]

This adds example notebooks for opening Sentinel-2 and Sentinel-3 in Julia.

I am not sure, how the installation of the Julia packages are going to work in the docker container.

@konstntokas

Is there anything that you need from my side to make sure, that this is working on the server?

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[konstntokas]

@felixcremer please open an issue here: EOPF-Sample-Service/eopf-container-images#48 like I have done for xarray-eopf and indicate in the issue what needs to be installed so that your notebooks are running on the Jupyter Hub.

[konstntokas]

Please make sure, that all checks are passing in this PR here. @felixcremer

In case you get stuck with the CI, @clausmichele may help you.

[clausmichele]

Hi @felixcremer, are the Manifest.toml and Project.toml files necessary to run the notebooks?

[konstntokas]

@felixcremer can you finish this PR soon? Or do you need help?

[clausmichele]

The .toml files are necessary for the environment set-up with the proper Julia packages, which are necessary to be installed in the docker image. @konstntokas @felixcremer I'd like to see the packages installed and test the notebook before merging.

[felixcremer]

I am currently waiting for the installation of the Julia packages in the docker container. EOPF-Sample-Service/eopf-container-images#49
Once this is resolved we should be able to test the notebook on the docker.

An alternative to the installation in the global environment would be to add the package installation here and run it from inside the notebook. I am not sure what you would prefer.