Throw typed exception for Parquet footer error

### Describe the enhancement requested

Currently, `ParquetFileReader` throws `RuntimeExceptions` when footer parsing fails.

This can be improved by throwing a `ParquetDecodingException` when footer parsing fails, so footer corruption surfaces as a typed exception instead of a plain `RuntimeException`. This helps avoid matching on error message to catch errors occurred during footer parsing.

### Component(s)

_No response_

Start in ParquetFileReader and inspect the footer-parsing failure paths alongside ParquetDecodingException. Confirm that corrupted-footer failures surface as the typed exception rather than RuntimeException, then verify the relevant reader behavior with the repository's existing tests.

Written by the indexing model from the issue text.