Add editions helper functions for resolving features to protoutil #283
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This helpers, in particular
protoutil.ResolveFeature
andprotoutil.ResolveCustomFeature
, will be used from updated checks forbuf breaking
, which will allow the tool to understand the features-related semantics of the schema.This way, it can correctly report issues with incompatible changes to features in editions source files. And it can also allow changing a file's syntax (like migrating from proto2 or proto3 to editions) as long as there are no actual semantic changes to the schema.