Adopting protobuf editions

More details here https://protobuf.dev/editions/overview/

with some immediate benefits such as https://go.dev/blog/protobuf-opaque

Start by reading the protobuf editions overview and the Go protobuf opaque API article linked in the issue. Then determine which parts of the remote-apis definitions and generation workflow would need adoption; the issue does not name files, tests, or a completion criterion, so the scope must be clarified before implementation.

Written by the indexing model from the issue text.