Proposal: Add a "prettify" option to $string()

[jhorbulyk]

If one has an object that they want to render as a string in JSONata, it is possible to produce a JSON representation of that object with the $string() function. However, this function produces a JSON output with minimal whitespaces which can be good for some situations but not good for others. It would be nice if there was a way to render "prettified" JSON (one line per field, indenting based on the field depth) to the output. Perhaps a second boolean argument to $string() called prettify might do the trick.

[jhorbulyk]

Simply adding a second argument to $string() isn't as straight forward as I expected since if one uses $string() in a hof, then the hof supplies an int as a second argument.

[andrew-coleman]

Resolved by #356