fix: parquet column parsing

[PhilippLgh]

Motivation

cryo seems to treat --txs args in path:column notation as tx hex values and fails to read them.

cryo performs a file.exists() check on a path that might be formatted as path:column.

it should handle these inputs as per:
- can use a parquet file --txs ./path/to/file.parquet[:COLUMN_NAME]

Solution

use the parse_file_column_reference() helper to retrieve only the path without the column part.

PR Checklist

• Added Tests
• Added Documentation
• Breaking changes

[sslivkoff]

hey sorry for the delay on this. the pr lgtm. formatting can be fixed by running cargo +nightly fmt --all