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ARROW-9631: [Rust] flight should depend on arrow, not the other way around

The core `arrow` crate had a dependency on the `arrow-flight` crate, which doesn't make sense. Arrow should have minimal dependencies and should not depend on protocols or servers. Flight should depend on Arrow instead.

I also changed the name of lib from `flight` to `arrow_flight` to match the Cargo manifest. I did this because I ran into compilation issues but I think this is worth changing anyway since there is already a `flight` crate on crates.io (unrelated to Arrow). I can try and roll back this change though if there are objections.

Closes #7892 from andygrove/ARROW-9631

Authored-by: Andy Grove <andygrove@nvidia.com>
Signed-off-by: Andy Grove <andygrove73@gmail.com>