Change log for WINDOWS_DHCP

Date Changes
2023-11-29 Aligned 'principal/target.hostname' and 'principal/target.asset.hostname' mapping.
2022-05-23 Extended WINDOWS_DHCP parser to support CEF format.
2022-04-13 Formal launch of Chronicle's Windows DHCP Parser.
This represents a comprehensive refresh to Windows DHCP parsing, and is built from the ground up for improved stability, coverage, and efficacy.
Added support for JSON+CSV format.
Extracted the CSV "Message" field from the JSON log for DHCP service logs.