Handle IPFS metadata outside the shape defined by the app

[ryanchristo]

src/util/validation/metadata.ts

      const ipfsData = await fetchIpfsData(getIpfsCID(metadata))
      // TODO: we aren't handling IPFS metadata that's outside the shape of our
      // expected data - could possibly add to the `other` field, or something
      // similar if we want to support in the future (add else block here)