Pipen-filters

- feat: enhance quote functions to handle None values with optional quoting

**Full Changelog**: https://github.com/pwwang/pipen-filters/compare/0.15.1...0.15.2

- chore(deps): update pipen dependency to version 0.17.*

**Full Changelog**: https://github.com/pwwang/pipen-filters/compare/0.15.0...0.15.1

- feat: support cloud paths for path-related filters

**Full Changelog**: https://github.com/pwwang/pipen-filters/compare/0.14.0...0.15.0

- feat: support cloud paths for path-related filters

**Full Changelog**: https://github.com/pwwang/pipen-filters/compare/0.14.0...0.15.0a1

- deps: bump pipen to 0.15

**Full Changelog**: https://github.com/pwwang/pipen-filters/compare/0.13.1...0.14.0

- docs: add API documentation

**Full Changelog**: https://github.com/pwwang/pipen-filters/compare/0.13.0...0.13.1