Render bevy images including render targets

We should be able to render bevy images using bevy vello and these should also include render targets. Some problems: 1. Bevy images can be formats not supported by vello or formats difficult to display like HDR textures. 2. Current vello API is very rough and requires `render.override_image`. Similar Vello Issue: https://github.com/linebender/vello/issues/664