Handle invalid list sort parameters

[Rohithmatham12]

Summary

• validate list sort paths before sorting table/CSV output
• return a Typer BadParameter when the requested path does not match returned rows
• add regression coverage for invalid sort-path casing

Fixes #137.

Testing

• POETRY_CACHE_DIR=/private/tmp/cortexapps-cli-poetry-cache poetry run pytest tests/test_utils.py -q