This function checks the types and classes of the columns in the data against the schema
defined in the Validator object.
check_types(validator)The updated Validator object with quality assurance (QA) entries added for type and
class checks. Each QA entry includes a description, pass/fail status, and any failing column IDs.
A Validator object containing the data and schema to check against. The schema
should define the expected type and optionally the class for each column.