Create a comparator utility to compare 2 parquet files and give a clear message for the differences

### Describe the usage question you have. Please include as many useful details as possible.

We have been using Parquet files in production and would like an automated process for regression testing.

Requirements

1. Sort elements in lists before comparison.

### Component(s)

Build a new module.

No file, test, or entry point is named; start by locating the existing Parquet Java modules and test conventions before designing the new comparator module. Use the stated regression-testing scenario to define comparison behavior, including sorting elements in lists. Done means two Parquet files can be compared and differences are reported in a clear message.

Written by the indexing model from the issue text.