Describe the bug, including details regarding any error messages, version, and platform.

GH-42102 added parquet-dump-footer. The implementation has the following problems:

• It has a redundant libarrow link. libarrow link should be done by parquet_shared/parquet_static implicitly.
• Its --help shows --debug but its implementation uses --json not --debug.

Component(s)

C++, Parquet