KingfisherManager.retrieveImage() hits disk on main thread even when opted into all async options

[jotai-coder]

• I have read the wiki page and cheat sheet, but there is no information I need.
• I have searched in existing issues, but did not find a same one.
• I want to report a problem instead of asking a question. It'd better to use kingfisher tag in Stack Overflow to ask a question.

Issue Description

KingfisherManager.retrieveImage() hits disk even when options are set to async

What

KingfisherManager.retrieveImage() hits disk on calling thread even when options are set to async when checking disk cache for presence of image. The issue with this is that KFImage() and image.kf.setImage() must be used on Main thread. This contributes to dropped frames. In UIKit, using KingfisherManager.retrieveImage manually (on a secondary thread), and then setting the image is simple workaround, but in SwiftUI it becomes more cumbersome.

Reproduce

v7.12
Use KFImage or kf.setImage in a large scrolling list. Observe hitches due to disk access on main

thread.

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