Fix track-processor package (aka Blurring) for firefox

Slavcho Cvetanovskirequested to merge
s.cvetanovski/k3k-web-frontend:track-processor-implementation into main

This MR vendors the livekit track processor in Order to fix it for Firefox.

The first commit move just the library source to our repo. The second commit changes the logic and needs a proper the review.

Closes #2209 #2216

Edited by Slavcho Cvetanovski

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