Provide an interface for specifying preferred output style

[spyoungtech]

The desired output style can be based on many factors, including indentation, quote preference (single or double), trailing commas in arrays/objects, etc.

There should be an interface for specifying this. Perhaps as argument(s) to dump[s]

[spyoungtech]

I'll also tack on that this should provide an interface for things like identifiers and when to display an integer as a hexadecimal number, or floats with leading/trailing decimal points.