arrow-flight 55.0.0

Apache Arrow Flight
Documentation 
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# Flight

## Generated Code

The prost/tonic code can be generated by running, which in turn invokes the Rust binary located in [gen](./gen)

This is necessary after modifying the protobuf definitions or altering the dependencies of [gen](./gen), and requires a
valid installation of [protoc](https://github.com/protocolbuffers/protobuf#protocol-compiler-installation).

```bash
./regen.sh
```

### Why Vendor

The standard approach to integrating `prost-build` / `tonic-build` is to use a `build.rs` script that automatically generates the code as part of the standard build process.

Unfortunately this caused a lot of friction for users:

- Requires all users to have a protoc install in order to compile the crate - [#2616](https://github.com/apache/arrow-rs/issues/2616)
- Some distributions have very old versions of protoc that don't support required functionality - [#1574](https://github.com/apache/arrow-rs/issues/1574)
- Inconsistent support within IDEs for code completion of automatically generated code