Pull request #3326: JSN: decode String.fromCodePoint() JavaScript function

Pull request #3326: JSN: decode String.fromCodePoint() JavaScript function

Merge in SNORT/snort3 from ~OSERHIIE/snort3:js_from_code_point to master

Squashed commit of the following:

commit a4e3c6cad84181fb907ccafec6e4941e4611a927
Author: Oleksandr Serhiienko <oserhiie@cisco.com>
Date:   Mon Mar 28 13:34:04 2022 +0300

    http_inspect: decode String.fromCodePoint() JavaScript function

        * utils: add support for supplementary characters in JS Normalizer
        * utils: add tracking and decoding of String.fromCodePoint() JavaScript
        function in JS Normalizer
        * utils: add unit test coverage
        * http_inspect: update dev notes
        * doc: update user manual