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David LiWes McKinney
18a5e3eb168
David Li authored and Wes McKinney committed 1a7519f4209
ARROW-9395: [Python] allow configuring MetadataVersion

Adds the environment variable `ARROW_PRE_1_0_METADATA_VERSION`. Can rename it to anything else.

I opted to remove `use_legacy_format` in underscore APIs, but kept it in public APIs.

Also makes the necessary changes to Flight.

Closes #7702 from lidavidm/arrow-9395

Authored-by: David Li <li.davidm96@gmail.com>
Signed-off-by: Wes McKinney <wesm@apache.org>