parquet-concat - handle large number of files

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

If some process creates a large number of parquet files, it would be nice to be able to run `parquet-concat` on these (location: `parquet/src/bin/parquet-concat.rs`). The current script will however open up too many file descriptors on most systems in a situation of many files.

**Describe the solution you'd like**

Make the implementation streaming based: files are opened, read and written from in order. The current implementation starts by opening all file descriptors.

**Describe alternatives you've considered**

**Additional context**

Start at parquet/src/bin/parquet-concat.rs and inspect how the command currently opens all input files before writing. Make processing streaming-based so files are opened, read, and written in order without retaining too many file descriptors; validate it with a large number of parquet files.

Written by the indexing model from the issue text.