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ARROW-10882: [Python] Allow writing dataset from iterator of batches

This binds InMemoryDataset to Python, allowing us to create and write back out datasets from iterables of record batches and various other objects.

Closes #9802 from lidavidm/arrow-10882

Authored-by: David Li <li.davidm96@gmail.com>
Signed-off-by: David Li <li.davidm96@gmail.com>