add json schema faker fill properties param

[brendarearden]

Addresses #2046
Summary
In an effort to make it easier to set the json schema faker fillProperties to false, without having to modify individual schemas, a new cli parameter has been added for mocking.

With this change you can now run prism mock -d --json-schema-faker-fillProperties=false api.oas3.yaml to ensure additional properties that are not explicitly named in your spec aren't returned when mocking. Setting this value with the command line will take priority over the value set in x-json-schema-faker

Additional Background
When using dynamic mocking, if additionalProperties is not set on each properties in a schema, json schema faker will fill in additional properties due to Prism's current global setting for fillProperties being set to true.

Adding a x-json-schema-faker object at the top level of your schema allows you to change Prism's global settings per schema if you don't want to set it at the cli level. See documentation for further details

Checklist

• The basics
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[EdVinyard]

I have only questions and minor suggestions; feel free to use them or ignore them.