Add ICON EU and Global Model Download and Archive Scripts

[jacobbieker]

Pull Request

Description

This downloads, combines, and uploads ICON NWP model data to HuggingFace, to start archiving it for future use, as there doesn't seem to be an archive of the model outputs anywhere I can find.

Fixes #14

How Has This Been Tested?

Running the script on Donatello and locally

• [ ] Yes

Checklist:

• [ ] My code follows OCF's coding style guidelines
• [ ] I have performed a self-review of my own code
• [ ] I have made corresponding changes to the documentation
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] I have checked my code and corrected any misspellings