New function: `array[string] split(string $separator, string $subject)`

[biochimia]

I propose the addition of a split() function, counterpart to the already standard join() function. split breaks a string into an array of substrings that are separated by $separator in the original $subject.

(Not entirely unlike Python's string.split() function)

[morokin]

Perhaps issue opened in wrong repo

[henning]

BTW: the python implementation README states this repository is the place for extension proposals: https://github.com/jmespath/jmespath.py#custom-functions (dont know about other implementation's repos)