* refactor: replace DispatchQueue + DispatchSemaphore with OperationQueue for image processing
* implement RequestRegistry and UnfairLock for managing cancellable requests
* implement requests registry for local and remote image processing
* remove Cancellable protocol and cancel method from request registry
* use mutex
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Co-authored-by: mertalev <101130780+mertalev@users.noreply.github.com>
