Support `replace=` rule

[ryanbr]

To further improve YT ads and its counters, replace= support would be nice.

filters.txt:||www.youtube.com/playlist?list=$xhr,1p,replace=/"adPlacements"/"no_ads"/
filters.txt:||www.youtube.com/playlist?list=$xhr,1p,replace=/"adSlots"/"no_ads"/
filters.txt:||www.youtube.com/watch?$xhr,1p,replace=/"adPlacements"/"no_ads"/
filters.txt:||www.youtube.com/watch?$xhr,1p,replace=/"adSlots"/"no_ads"/
filters.txt:||www.youtube.com/youtubei/v1/player?$xhr,1p,replace=/"adPlacements"/"no_ads"/
filters.txt:||www.youtube.com/youtubei/v1/player?$xhr,1p,replace=/"adSlots"/"no_ads"/

https://adguard.com/kb/general/ad-filtering/create-own-filters/#replace-modifier
https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/API/webRequest/filterResponseData#browser_compatibility
Implemented here: gorhill/uBlock@7c3e060c01

[ShivanKaul]

(Not supported on Chrome, only on Firefox.)

[ShivanKaul]

Also see https://github.com/brave-experiments/unsupported-filters/blob/main/reports/youtube.md