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David Li authored and GitHub committed f2f3e956055
GH-43456: [Java] Add Opaque canonical extension type (#43460) ### Rationale for this change Add the newly ratified extension type. ### What changes are included in this PR? The Java implementation only. ### Are these changes tested? Yes ### Are there any user-facing changes? No. * GitHub Issue: #43456 Authored-by: David Li <li.davidm96@gmail.com> Signed-off-by: David Li <li.davidm96@gmail.com>