For all worker messages, create a type "string" serialization format

[TimDaub]

• see:

  schema/src/schema.mjs

  Line 228 in b5298e8

  export const workerMessage = {

• Assuming that we can use linked data to progressively resolve a neume track, then e.g. a partial track could look like this

{
...
  erc721: {
    owner: "json-rpc://cloudflare-eth.com/eth_call?params=["owner()]..."
  }
}

where we could then serialize erc721.owner into a worker message, fetch the result and then replace it with the value of owner

• task: come up with a useful serialization scheme for all worker messages. Can they be URIs?