Allow to specify width AND height

[mahnunchik]

Allow to specify width AND height to resize and crop to specific dimensions.

const metadata = await Image(src, {
  sizes: [{ width: 300, height: 200 }, { width: 600, height: 400} ],
  formats: ["avif", "jpeg"]
});

As on option the same result may be obtained by specifying aspect ratio.

[mahnunchik]

Related: #31

[AleksandrHovhannisyan]

(Might be worth just posting this code in #31 as a suggested API so we only have one ticket for it)

[zachleat]

Yeah let’s organize over at #31 for this. I do like your sample code!