add metadata to all final correspondence tables.

[mfastudillo]

metadata are essential for reproducibility.

I created a notebook starting doing this, but it needs to be done, at least for all the csv files in the final_tables folder.

[mfastudillo]

I was trying to add metadata with the frictionless datapackage description for resources (silly script here) but it fails with an error as if the path is not safe. reading frictionless.helpers.is_safe_path the problem seems to me that paths can't neither have .. nor be absolute... I guess the option then is to.. put it as function of the module ?