TODO: fill out currently missing registries:
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MOQT version numbers
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Setup parameters
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Subscribe parameters
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Subscribe Error codes
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Subscribe Namespace Error codes
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Announce Error codes
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Announce Cancel Reason codes
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Message types
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MOQ Extension headers - we wish to reserve extension types 0-63 for standards utilization where space is a premium, 64 - 16383 for standards utilization where space is less of a concern, and 16384 and above for first-come-first-served non-standardization usage.
TODO: register the URI scheme and the ALPN and grease the Extension types