protobuf: enable protobuf standard required
mechanism
#2622
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See https://google.aip.dev/203. Currently, there is support for an option
(cue.opt).required
. This is fine, but requires importing thecue.proto
, and exposes cue to the public facing API.With this approach, the built-in field behavior mechanism can be used, which is the standard way to declare a required field in proto.