Integration Testing for Parquet CLI tools

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

We have various CLI tools under the parquet crate, currently these have fairly limited integration testing.

**Describe the solution you'd like**

Some sort of basic test harness that runs the binaries, or possibly the internal logic, against some test files and verifies the output is as expected.

**Describe alternatives you've considered**

**Additional context**

Start by inspecting the CLI tools under the parquet crate and the existing test setup. Identify representative test files and the expected command outputs, then define a basic harness that exercises the binaries or internal logic. Done means the selected tools run against those files and their outputs are verified by integration tests.

Written by the indexing model from the issue text.