[FR]: Parse meta data for images with animation

[huandu]

Is there an existing issue for this?

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Describe the problem

Besides image sizes, I want to read more metadata from animated images like GIF and WebP, e.g. frame count, animation duration, etc. As parsing animation files at runtime is relatively expensive, it would be great if flutter_gen can parse this information for me.

Describe the solution

Add a new optional option parse_animation in config. If it's true, flutter_gen should parse animated images and write parsed information in AssetGenImage.

Additional context

No response

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