Allow bigger arguments data volume

[krystian-panek-vmltech]

Right now since arguments need to be serializable and are passed into Sling Job as string property, the most probably the max limit of args size is 16 MB (based on https://medium.com/@bsaravanaprakash/how-big-can-string-properties-get-in-aem-understanding-string-property-limits-in-aem-b5635aec6fcf)

If arguments will be stored separately as JSON payload saved as file in the repo then that limitation will be gone.
But the complexity of whole impl will be much increased then.