Feature Request: AVIF image format support

[shrekuu]

Hi dear Spatie team:

Do you mind adding AVIF image format support?

https://caniuse.com/?search=avif

I see AVIF images are much smaller than WEBP images.

(I am building an image processing app for my app. It serves images of different formats according to thisAccept: image/avif,image/webp,image/apng,image/svg+xml,image/*,*/*;q=0.8 from the request header.)

[freekmurze]

If this is easy to add, feel free to send a PR

Make sure to include tests and an updated readme.