Change log for CISCO_NX_OS

Date Changes
2025-02-07 Enhancement:
- Added support for new pattern of syslog logs.
2025-02-05 Enhancement:
- Added a new Grok pattern to support new log formats.
- Mapped "Hostname" to "intermediary.hostname".
- Mapped "ip_1" to "intermediary.ip".
2024-12-23 Enhancement:
- Changed mapping of "device_ip" from "principal.ip". If "device_ip" is an IP address, it is mapped to "intermediary.ip". Otherwise, it is mapped to "intermediary.hostname".
2023-09-05 Enhancement:
- Added a new Grok pattern to support new log formats.
2023-08-11 Enhancement:
- Added support for logs containing "AAA_ACCOUNTING_MESSAGE".
- Added new Grok pattern to support new log formats.
- Reduced number of "GENERIC_EVENTS" by mapping "metadata.event_type" to a more specific enum value.
2023-06-28 - Added new Grok pattern to parse date.