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ARROW-17867: [C++][FlightRPC] Expose bulk parameter binding in Flight SQL (#14266)

This allows us to send multiple parameters and have them all executed, instead of having to do multiple round trips per row - this technically existed in the API but the sample server didn't implement it properly

Also contains misc cleanups on the API, and removes client_test.cc since the mocks are brittle

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