feat: add HelloAndroid_16_OkHttp ClientHello fingerprint

[dmakarovg]

This PR introduces the HelloAndroid_16_OkHttp fingerprint to accurately mimic the ClientHello of Android 16 using OkHttp 5.3.0.

Key Changes:

• Added HelloAndroid_16_OkHttp constant and its corresponding ClientHelloSpec mapping.
• Matched the exact CipherSuites and Extensions lists (and their strict order) based on real-world packet captures.
• Ensured full TLS 1.3 compatibility by correctly implementing SupportedVersions, KeyShare, and PSKKeyExchangeModes extensions.
• Omitted GREASE values, ALPS, and certificate compression extensions to align strictly with vanilla OkHttp behavior.