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David Li authored and GitHub committed dea09ec9c0d
GH-43455: [Go] Add Opaque canonical extension type (#43459) ### Rationale for this change Add the newly ratified extension type. ### What changes are included in this PR? The Go implementation only. ### Are these changes tested? Yes ### Are there any user-facing changes? No. * GitHub Issue: #43455 Lead-authored-by: Matt Topol <zotthewizard@gmail.com> Co-authored-by: David Li <li.davidm96@gmail.com> Co-authored-by: Joel Lubinitsky <33523178+joellubi@users.noreply.github.com> Signed-off-by: Matt Topol <zotthewizard@gmail.com>