Allow SetParametersFromFile to take several files

[tonynajjar]

Feature request

Feature description

I use a hierarchical yaml configuration. I can pass several param files to the Nodes and they will handle the overriding. It would be nice if SetParametersFromFile could take a list of files as well to mirror that behavior.

Implementation considerations

Not sure how to do this in a backwards-compatible way since the input would need to change from a string to a list of strings. (And the Action probably needs to be renamed to SetParametersFromFiles (with an s)).
How about creating SetParametersFromFiles on the side and slowly deprecating SetParametersFromFile?