While using ImagePrefetcher(), RetryStrategy is not working.

[Ayushjain745]

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Issue Description

I have created ImagePrefetcher() and with the help of KingfisherOptionsInfo I have given the RetryStrategy but it seems the strategy not working.

What

func prefetchAllImages(completion: @escaping (Bool) -> Void) {
        ImageCache.default.clearDiskCache()
        ImageCache.default.clearMemoryCache()
        DispatchQueue.main.asyncAfter(deadline: .now() + 1) {
            // Get all image URLs from ImageResourceUrl enum
            let urls = ImageResourceUrl.allCases.map { $0.url }
            let downloader = ImageDownloader(name: "custom")
            downloader.downloadTimeout = 45
            // Retry strategy: attempt up to 3 retries with a 1-second interval
            let retryStrategy = DelayRetryStrategy(maxRetryCount: 3, retryInterval: .seconds(1))
            // Set options with custom downloader and retry strategy
            let kingFisherOptions: KingfisherOptionsInfo = [
                .downloader(downloader),
                .retryStrategy(retryStrategy)
            ]

            // Prefetch images with completion handler
            let prefetcher = ImagePrefetcher(urls: urls, options: kingFisherOptions, progressBlock: { skippedResources, failedResources, completedResources in
                // You can use these counts for progress feedback
                print("Ayush Completed: \(completedResources.count), Failed: \(failedResources.count), Skipped: \(skippedResources.count)")
            }, completionHandler: { skippedResources, failedResources, completedResources in
                if failedResources.isEmpty {
                    // All images downloaded successfully
                    completion(true)
                } else {
                    // Some images failed to download
                    completion(false)
                }
            })

            prefetcher.maxConcurrentDownloads = urls.count
            prefetcher.start()
        }
    }

Reproduce

[The steps to reproduce this issue. What is the url you were trying to load, where did you put your code, etc.]

Other Comment

I can see in the ImagePrefetcher() class, retry startegy is not assigned to the manager

    init(sources: [Source], options: KingfisherOptionsInfo?) {
        var options = KingfisherParsedOptionsInfo(options)
        prefetchSources = sources
        pendingSources = ArraySlice(sources)

        // We want all callbacks from our prefetch queue, so we should ignore the callback queue in options.
        // Add our own callback dispatch queue to make sure all internal callbacks are
        // coming back in our expected queue.
        options.callbackQueue = .dispatch(prefetchQueue)
        optionsInfo = options

        let cache = optionsInfo.targetCache ?? .default
        let downloader = optionsInfo.downloader ?? .default
        manager = KingfisherManager(downloader: downloader, cache: cache)
}

[Adobels]

It looks like the retry strategy defined in KingfisherOptionsInfo is not utilized by ImagePrefetcher, as it is currently only used by KingfisherManager.shared.retrieveImage, and UIImageView().kf.setImage.