Change log for CISCO_VPN

Date Changes
2025-03-13 Enhancement:
- Added a grok pattern to parse userId from the log.
- Added a grok pattern to parse hostname from the log.
2025-01-30 Enhancement:
- Mapped puser_id to principal.user.userid.
2024-12-18 Enhancement:
- Added support for new format of logs.
2024-12-05 Enhancement:
- Added support to parse new format of unparsed SYSLOG logs.
2024-11-07 Enhancement:
- Added support to parse new format of unparsed SYSLOG logs.
2024-07-02 Enhancement:
- Added support to parse new format of unparsed logs.
- Changed src_ip mapping from target.ip to principal.ip.
- Changed dst_ip mapping from principal.ip to target.ip.
2024-05-27 Enhancement:
- Added support to parse dropped logs that wer dropped due to UDM validation and a missing target field.
2024-03-25 Enhancement:
- Added support to parse new format unparsed logs.
2024-02-23 Enhancement:
- Parsed the logs with event IDs 733100,725011,737034,737006,106023.
- Added on_error check for Grok patterns.
2024-01-15 Enhancement:
- Added new Grok patterns for the support of new patterns of syslog logs.
- If observer.ip is a valid IP value, mapped observer to observer.ip.
2022-08-19 Enhancement - Parsed The logs with event_id's :- 113012,113015,722033,722035,716058,716002,716038,722028,722032,722034,716001,716059,305012,106015,
305011,302015,302016,725016,302020,302014,302013,302021,106006,110002,605005,605004,106001,734003,734001,725002,607001,725001,106012,
725005,611101,611102,402119,737026,313009,725007,725003,109207,500003,500004,444100,444102,602303,602304,315011,602101,302004.
- Updated the event_type from GENERIC_EVENT to USER_UNCATEGORIZED when event_id=113014.
- Updated the event_type from GENERIC_EVENT to USER_LOGIN when event_id=113016.