SSC updates

[aram356]

Description

• Remove User-Agent and Accept-language inputs to keep only:
• IPv4 address OR summarized IPv6 address (If dual stack then pick IPv6 address)
• Salted phrase
• Remove templating of Synthetic ID in toml config files
• Rename header to “X-ts-ssc:” everywhere
• Cookie ID field should be “ts-ssc:” instead of old name
• Confirm expiration is 1 year (or Safari / Chrome max)
• No backward compatibility needed with SyntheticID
• Keep current 64 character for IP + salted hash with “.” and 6 character unique identifier
• Update documentation site on github io to rename SyntheticID with “Server Side Cookie”