Support for wider variety of compression options with image assets

[mdekrey]

Body

Summary

We should improve defaults and give more control to end-users when generating new image formats or sizes.

Background & Motivation

When resizing images through getImage (or any of the higher-level components, such as <Picture /> component), options inherent in the source image are lost, most notably the use of "lossless" compression from PNGs and TIFFs. Both WebP and AVIF support lossless modes, but the current implementations do not leverage them.

Changes to defaults should not be taken lightly; this can cause significant changes in quality and image sizes for end users. When a getImage call is made without resizing or changing format of the source image, I've already noticed that sometimes the output is a larger file size than the original (fyi, I am using "sharp") due to different defaults than the source image.

I would suggest passing options through to the image service, the same way the MDX plugin allows passing options to remark, etc.

Goals

• Provide the developer additional options for compression of images
• Use smart defaults to prefer lossless compression when the source image is saved using lossless compression