Land ERA5 forcing data artifact

[kmdeck]

Purpose

Adds the land forcing data (1 year from ERA5 at 1 degree resolution).

To-do

update README

Content

• create_artifacts.jl
• output artifacts.toml information
• File was transferred to cluster and Overrides.toml updated.

Review checklist

I have:

• followed the codebase contribution guide: https://clima.github.io/ClimateMachine.jl/latest/Contributing/
• followed the style guide: https://clima.github.io/ClimateMachine.jl/latest/DevDocs/CodeStyle/
• followed the documentation policy: https://github.com/CliMA/policies/wiki/Documentation-Policy
• checked that this PR does not duplicate an open PR.

In the Content, I have included

• relevant unit tests, and integration tests,
• appropriate docstrings on all functions, structs, and modules, and included relevant documentation.

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• I have read and checked the items on the review checklist.

[Sbozzolo]

Can you also add a license/requested acknowledgments (if available)?

[kmdeck]

I will double check what I have with @braghiere

[kmdeck]

@braghiere do you know if this is enough regarding citation of ERA5? I followed their instructions here:
https://confluence.ecmwf.int/display/CKB/Use+Case+2%3A+ERA5+hourly+data+on+single+levels+from+1940+to+present

[braghiere]

For the references of variables that looks fine. A more formal academic citation used for ERA5 is:

Hersbach, H., Bell, B., Berrisford, P., Hirahara, S., Horányi, A., Muñoz-Sabater, J., Nicolas, J., Peubey, C., Radu, R., Schepers, D., Simmons, A., Soci, C., Abdalla, S., Abellan, X., Balsamo, G., Bechtold, P., Biavati, G., Bidlot, J., Bonavita, M., … Thépaut, J.-N. (2020). The ERA5 global reanalysis. Quarterly Journal of the Royal Meteorological Society, 146(730), 1999–2049. https://doi.org/10.1002/QJ.3803