#3369 feat(taps): In OpenAPI schema normalization, treat all fields as `nullable` unless they are part of a primary key Pull request opened by edgarrmondragon ## Summary by Sourcery Treat all fields as nullable by default in OpenAPI schema normalization, marking only primary key properties as non-nullable by passing key_properties through preprocessing and normalization flows New Features: • Add key_properties parameter to schema preprocessing and normalization methods to distinguish primary keys Enhancements: • Propagate key_properties (stream.primary_keys) through SchemaSource and StreamSchema descriptor to schema preprocessing Tests: • Update tests to expect default nullable types for all fields except primary keys meltano/sdk