Add Unified Social Credit Code (USCC) validation to the format validator. #33
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Add Validator for Unified Social Credit Code (USCC)
Description:
This PR introduces a new feature that enables the format validator to verify the correctness of the Unified Social Credit Code (USCC). The USCC is a crucial identifier for businesses in China, and ensuring its validity is essential for accurate data processing.
Changes:
Added a utility function to check the validity of a USCC, which is invoked by the format validator.
Implemented regex and checksum validation to ensure compliance with the official USCC standard.
Included unit tests to verify the correctness of the validation function.