Unify metadata on image worker

[vikiival]

1. install hyperdata
2. when content is application/json do normalization
3. save to R2 (as it is now)

[vikiival]

@preschian thinking what if we store JSON metadata somewhere else? like KV or D1 ?

[preschian]

@vikiival oh yes, I'm thinking like this also if we put that in our workers. ref: #95

create a new endpoint, something like image-w.com/metadata/cid
if the content non-json, redirect it to our normal image workers to image-w.com/ipfs/cid
else return our predefined structure, something like this:

{
  media: '', // img/3d/audio/video
  thumbnail: '', // future research if the media non-image. is it possible or not to create a thumbnail from that in workers. ref: https://github.com/kodadot/nft-gallery/issues/6050
  mimeType: '',
  raw: {
    ...,
    // keep original metadata from ipfs here
    ...,
  }
}

[vikiival]

media

Should I rename animationUrl to Media?

Also raw was added as _raw