OPNsense/Firewall/Rules: show by categories about rules HOT 2 CLOSED

First try.
Completely client-side version (only opnsense_legacy.js touched).
see comments in code
Should work on all rules (filter, redirect) pages.
Comments, criticisms, suggestions or use in your own better versions are very welcome )

upd: oops. fix for dark themes applied
opnsense-patch -a kulikov-a 6fb0055
kulikov-a/core@6fb0055

Warning for those who want to test (if any): at the moment, clicking the "select all" checkbox causes all rules (including hidden ones) to be selected. also applies to current versions of opnsense when working with the category filter.
pr opnsense/core#5538
please opnsense-patch d387c59 before testing "select all" behavior on 21.7.8/22.1

upd. no actions needed for 21.1.1: d387c59 is there, opnsense-patch -a kulikov-a 6fb0055 still works

from rules.

no feedback no progress

from rules.