CDN Support with Asset Prefix for non css and js assets

[EasileleM]

Describe the feature you'd like to request

Now, according to docs, assetPrefix only influence css and js files from public folder, so in order to prefix other assets (e.g. jpg, woff2 and etc) with CDN we need to make our own solution and use it across our code base. From my perspective, it is common scenario for users, who use NextJS with CDN, so it would be cool feature to implement on NextJS side.

Describe the solution you'd like

assetPrefix influence non css and js assets too.
Probably, it would be great to have assetPrefix as an object with such structure.

assetPrefix: {
   [regexToMatchCertainFilenames: string]: string
}