Older examples needs to be updated for JSONFiles API changes

Describe the issue
This example has some API calls that don't work with the updated version of sasctl - changes to JSONFiles:
https://github.com/sassoftware/python-sasctl/blob/master/examples/pzmmCompleteModelExampleMLFlowSklearn.ipynb

For example, writeModelPropertiesJSON is now write_model_properties_json and has many changes in the parameters.

Other examples:
writeFileMetadataJSON
writeVarJSON

I checked other examples and it seems any of them 6 months or older are now out of date with the newer sasctl API.

To Reproduce
Run this command using latest sasctl

J.writeVarJSON(inputsDict, isInput=True, jPath=zipFolder)

and you will get things like

AttributeError: 'JSONFiles' object has no attribute 'writeVarJSON'. Did you mean: 'write_var_json'?

Version
The SHA is 729e72c8785065109ccfd1ffdb9816d4bf1dce55

Inizia da examples/pzmmCompleteModelExampleMLFlowSklearn.ipynb e confronta le relative chiamate JSONFiles con l'API sasctl attuale. Cerca writeModelPropertiesJSON, writeFileMetadataJSON e writeVarJSON negli altri esempi, quindi aggiorna le chiamate e i parametri obsoleti. Il lavoro è completato quando gli esempi meno recenti vengono eseguiti con l'ultima versione di sasctl senza l'AttributeError segnalato.