Adding additional fields

[jackfowler]

Hi there,
I think it would be a super handy feature if we could add additional fields to a Cloudinary asset. Just the same way as you can with Images or Files within Sanity. For example:

{
  name: 'portfolioItem',
  type: 'cloudinary.asset',
  fields: [
    {
      name: 'link',
      type: 'link',
    },
   ]
},

I know I could nest the asset in an object, but this breaks the multiple uploads, which is a bit of a deal breaker.

I'd be happy to have a go at this myself and open a PR, would someone be able to point me in the right direction? Or even just let me know if it will be possible?

Thanks!