Re: [w3c/manifest] Use WebIDL to describe the manifest data structure (#611)

I think it would be better if we started with the high-level goals for this syntax and then see what kind of schema language would be the most appropriate fit.

* Parsing always uses https://infra.spec.whatwg.org/#parse-json-from-bytes. (Otherwise the processor returns failure.)
* A https://mimesniff.spec.whatwg.org/#json-mime-type is required. (Otherwise the processor returns failure.)
* There needs to be a way to declare types for fields. (It probably makes sense for these types to match IDL types.)
* A type-mismatch is equal to the field being set to undefined.

Things I'm unclear on:

* Is the top-level value always an object?
* Do we need to be able to require fields?
   * Only top-level or also nested fields?
   * Is such a field is undefined, does it mean the processor returns failure?

Are there other requirements here?

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