WebP support

[inliquid]

Hey @disintegration,

I have read your comments posted a years ago saying that WebP is not widely used. However, nowadays it seems that adoption is on it's way in the web
https://caniuse.com/?search=webp
and since it's superior to JPEG, PNG or GIF in many aspects, the demand will grow. What about adding this functionality even at cost of introducing some extra dependency? Maybe implement it with some kind of an add-on mechanism?

[bk-oak]

I believe that the issue is likely the lack of native encoding of WEBP within the x/image package. see the following feature requests. golang/go#45121

[benjiro29]

https://git.sr.ht/~jackmordaunt/go-libwebp

Its Experimental, but works great so far.