Have `KFAnimatedImage` release frames when app goes to background

[Ceylo]

Hi,

MemoryStorage already does a good job at releasing memory when the app goes to background. I would like KFAnimatedImage to do the same.

At the moment I'm looking at how to reduce memory footprint when app is in background, in order to have the app killed less often in background. What I see is that AnimatedImageView frames takes about 25% of the remaining memory.

Callstack is as follow in Instruments:

  32.81 MB     closure #1 in AnimatedImageView.Animator.prepareFramesAsynchronously()	
  32.81 MB     AnimatedImageView.Animator.setupAnimatedFrames()	
  31.78 MB     AnimatedImageView.Animator.loadFrame(at:)	
  31.48 MB     -[UIImage imageByPreparingForDisplay]	
  31.42 MB     -[_UIImageCGImageContent contentPreparedForDisplay]	
  31.34 MB     -[_UIImageCGImageContent _contentWithCARenderRef]	
  31.32 MB     CA::Render::copy_image(CGImage*, CGColorSpace*, unsigned int, double, double)	
  23.76 MB     CA::Render::(anonymous namespace)::create_image_by_rendering(CGImage*, CGColorSpace*, unsigned int, double, CA::Render::ImageCopyType)	
  13.83 MB     CA::Render::aligned_malloc(unsigned long, void**, unsigned long)	
  13.83 MB     mmap	

I'd like this memory to be released, and the frames to be loaded again if the view is visible upon foreground transition.
Currently I'm using Kingfisher 8.6.0 on iOS 26.0.1.