Multiprocessing for DataFrame validation

What's Changed

• Add pre-commit action by @wesselhuising in #1
• Improve performance by replace drop with slicing by @wesselhuising in #2
• Add parallel processing functionality to parse_df method by @wesselhuising in #7

New Contributors

• @wesselhuising made their first contribution in #1

Full Changelog: https://github.com/wesselhuising/pandantic/commits/0.2.0