Normalize TLS fields and harden JA4 parsing #280
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Fixes #273
This PR introduces centralized normalization helpers for TLS fields (extensions, ciphers, versions, signature algorithms) to consistently handle mixed input types (ints, hex strings, decimal strings) in the Python implementation.
It simplifies JA4/JA4S code paths by removing ad-hoc formatting, fixes edge cases with empty or missing fields, and makes parsing more robust against malformed packets.