[Release] Apache Arrow Release 19.0.0
MINOR: [Release] Update versions for 19.0.0 (#371)

I ran `./dev/release/01-bump-versions.sh 18.1.0 19.0.0`

Also fixed:

- Update CMakeLists.txt to use standard CMake target name (see
https://github.com/google/googletest/blob/main/googletest/README.md). I
think this change is better.
- Updated Flight cookbook for Parquet changes in Arrow 19.0.0,
https://github.com/apache/arrow/issues/44784
7 files changed