[JavaScript] String.split accepts RegExp as delimiter

[fartinmartin]

The current types for String.split only allows for string delimiters:

Types-for-Adobe/shared/JavaScript.d.ts

Lines 1094 to 1100 in 67bcaf7

	/**
	* Splits a string into a group of substrings, places those strings in an array, and returns the array.
	* The substrings are created by breaking the original string at places that match delimiter, the delimiter characters are removed.Returns an array whose elements are the substrings.
	* @param delimiter Specifies the string to use for delimiting. If delimiter is omitted, the array returned contains one element, consisting of the entire string.
	* @param limit
	*/
	split(delimiter: string, limit?: number): string[]

But this will work:

// test-in-ae.jsx
alert("Hello there, pal!".split(/[\s,]+/).length)

This PR adds RegExp to type:

split(delimiter: string | RegExp, limit?: number): string[]