@azvoleff Please could you provide feedback on this PR

This looks like the right place for the substantive FAO-WOCAT code, and the right way to wrap it to produce a Trends.Earth readable output. The best approach would likely be to take Cesar's Javascript code and start with just a direct copy/paste into this script. The method names between the Javascript and Python Earth Engine APIs is similar enough that fixing syntax errors, list generation, etc., is usually all that is needed to adapt the actual algorithm code itself.

Once that is done then we'll need a new script added within the gee/ folder of the main trends.earth repository to upload to our trends.earth API. That script should access the functions defined within this repository to actually process the data and return the output to a user who submits a job to our API.