ARROW-11545: [Rust] [DataFusion] SendableRecordBatchStream should implement Sync
ARROW-11545: [Rust] [DataFusion] SendableRecordBatchStream should implement Sync

Closes #9439 from andygrove/SendableRecordBatchStream-sync

Authored-by: Andy Grove <f68909d51919859739a1c5d24450a2cc1026e93b@gmail.com>
Signed-off-by: Andy Grove <f68909d51919859739a1c5d24450a2cc1026e93b@gmail.com>

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