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

I think it's worth looking at schema languages for JSON, but I suspect we need a custom one, since we want forward compatibility. I.e., ignore optional fields that do not match the schema and ignore fields outside the scope of the schema.

If we need something custom, taking inspiration from dictionaries in IDL does seem appropriate, something nearly identical might even be acceptable, but I'm not sure it's worth trying to create a shared abstraction there as the goals are rather different and it'll be a hassle to maintain for either side.

I guess if I were to work on this I'd copy the IDL dictionary work and simplify it to fit the needs of what we need for all these JSON resources.

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