Implement FlightSQL Client

[avantgardnerio]

Is your feature request related to a problem or challenge? Please describe what you are trying to do.

As someone who uses the FlightSQL Server base provided by arrow-rs, I would like to test my server, so I can ensure there are no regressions. Presently, I have to test manually because the only FlightSQL client I am aware of is in Java.

Describe the solution you'd like

Create a FlightSQL client implementation in arrow-rs.

Describe alternatives you've considered

1. Manually test forever
2. Do not test