Beta release: v0.19.0b4

What's Changed

• fix pyspark tests when run on full test suite by @cosmicBboy in #1593
• Bugfix/1580 by @cosmicBboy in #1596
• Set pandas_io.from_frictionless_schema to use a raw string for docs by @mark-thm in #1597
• Add a generic Series type for polars by @baldwinj30 in #1595
• Add StructType and DDL extraction from Pandera schemas by @filipeo2-mck in #1570
• Clean up typing for pandas GenericDtype by @cosmicBboy in #1601
• Adding warning for unique in pyspark field and a test showing the issue as well as config when it works. by @zippeurfou in #1592
• bugfix/1607: coercion error should correctly report relevant failure cases by @cosmicBboy in #1608
• Create a common DataFrameSchema class, update mypy used in pre-commit by @cosmicBboy in #1609

New Contributors

• @mark-thm made their first contribution in #1597
• @baldwinj30 made their first contribution in #1595
• @zippeurfou made their first contribution in #1592

Full Changelog: v0.19.0b3...v0.19.0b4