Implement ability to send js challenge according custom rules about tempesta HOT 1 OPEN

We discussed in the chat that we should add a new ACTION for HTTPtables - jsch. I.e. we can write rules like

http_chain {
    hdr "accept" == '*; */*' -> jsch;
    mark == 1 -> jsch;

Please note that */* in the first rule can be in any place of the the value, so we might need something like '*/*', so we need #496 for this (there is no strict dependency, but we do need regexps for real work with HTTPtables).

Also please create a functional tests for this feature or a task for the tests.

This JSCH usage should be deployed on our website

With the discussion #2025 (comment) need to add a best practice examples to the Wiki how to properly configure JSCH based on Accept header. E.g. see https://developers.cloudflare.com/waf/reference/cloudflare-challenges/

from tempesta.