Add limited support for `$cookie` rules

Safari content blocking API provides rules with action `block-cookies`:

> Strips cookies from the header before sending it to the server. This only blocks cookies otherwise acceptable to Safari's privacy policy. Combining with ignore-previous-rules doesn't override the browser’s privacy settings.

This is nothing compared to what `$cookie` rules are capable of in other AdGuard versions. However, we can improve the situation a little bit if we accompany `block-cookie` content blocking rules with "advanced rules". The purpose of the "advanced rules" will be to use Javascript and remove cookies via `document.cookie`.

Briefly, here's what I suggest.

A rule like that: `$cookie=test,domain=google.com`

Should be converted to two rules.

* One is a safari content blocking API rule: `{ trigger: { "if-domain": "google.com*" }, "action": { type: "block-cookies" } }`.
* The other one is an advanced rule that will run a script removing the cookie using `document.cookie`

This is certainly far from the `$cookie` rules capabilities, but it's better than nothing anyways.