robyn_write() generates light JSON files with all the information
required to replicate Robyn models. Depending on user inputs, there are
3 use cases: only the inputs data, input data + modeling results data,
and input data, modeling results + specifics of a single selected model.
To replicate a model, you must provide InputCollect, OutputCollect, and,
if OutputCollect contains more than one model, the select_model.