Change log for WINDOWS_DNS

Date Changes
2023-05-31 - For DNS record requests of type A, AAAA and PTR, extracted data from answer section of 'message' field and mapped it.
- Mapped '' value to 'target.hostname'.
2023-05-02 Added support for DNS record requests of type A, AAAA and PTR.
2023-02-15 Added a grok pattern to handle date format(MM-DD-YYYY) and time format without AM/PM.
2022-07-08 Prioritized mapping events with STATUS_UPDATE instead of GENERIC_EVENT where "principal.ip" or "target.ip" or "principal.hostname" are not null.
2022-05-11 Added support for Syslog header+JSON format.
2022-04-13 Formal launch of Chronicle's Windows DNS Gold Parser.
This represents a comprehensive refresh to Windows DNS parsing, and is built from the ground up for improved stability, coverage, and efficacy.