[Format] Add Opaque canonical extension type #43453
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As proposed on the mailing list: https://lists.apache.org/thread/4pykofrzvkl7dwsnzys8rwnq2owfnt43
- [C++][Python] Add Opaque canonical extension type #43454
- [Go] Add Opaque canonical extension type #43455
- [Java] Add Opaque canonical extension type #43456
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