Change log for CISCO_IOS

Date Changes
2025-05-14 Enhancement:
- Added support to handle timezone like `SGT`, `JST`, `HKG`, and `CN` for `event.idm.read_only_udm.metadata.event_timestamp` UDM field mapping by including timezone.
2025-05-08 Enhancement:
- event.idm.read_only_udm.security_result.severity: Removed mapping of "ALERT" from "event.idm.read_only_udm.security_result.severity" UDM field and mapped "LOW" instead.
2025-04-29 Enhancement:
- event.idm.read_only_udm.intermediary.hostname: Removed mapping of `inter_host`, `target_host`, `intermediary_host` from `event.idm.read_only_udm.intermediary.hostname` UDM field, when `inter_host`, `target_host`, `intermediary_host` are valid IP's.
- event.idm.read_only_udm.intermediary.ip: Mapped `inter_host`, `target_host`, `intermediary_host` raw log fields with `event.idm.read_only_udm.intermediary.ip` UDM field when `inter_host`, `target_host`, `intermediary_host` are valid IP's.
- Added a Grok pattern to parse a new format of syslog logs.
- event.idm.read_only_udm.principal.hostname: Removed mapping of `source_facility` from `event.idm.read_only_udm.principal.hostname` UDM field by modifying Grok pattern.
- event.idm.read_only_udm.intermediary.hostname: Mapped `inter_host` raw log field with `event.idm.read_only_udm.intermediary.hostname` UDM field by modifying Grok pattern.
2025-04-24 Enhancement:
- Added support to handle `event.idm.read_only_udm.metadata.event_timestamp` UDM field mapping by including timezone.
2025-04-10 Enhancement:
- Added a Grok patterns to parse a new format of SYSLOG logs.
- event.idm.read_only_udm.metadata.event_timestamp: Added a new date pattern to map "ts" to "event.idm.read_only_udm.metadata.event_timestamp" UDM field.
2025-03-18 Enhancement:
- Added a grok pattern to parse a new format of syslog logs.
2025-03-17 Enhancement:
- Added a grok pattern to extract user name, and source port from the cisco_message field.
- Mapped the extracted user name to principal.user.userid.
- Based on existing mapping src_port will be mapped to principal.port.
2025-03-14 Enhancement:
- Added grok patterns to parse a new format of syslog logs.
2025-03-12 Enhancement:
- Added Grok patterns to parse new format of logs.
- Mapped "tls_cipher" to "network.tls.cipher".
- Mapped "tls_client" to "network.tls.client.supported_ciphers".
- Mapped "Chassis_data" to "additional.fields".
- Mapped "timezone" to "additional.fields".
- Mapped "cisco_message" to "network.application_protocol".
2025-03-11 Enhancement:
- Added new Grok patterns to parse new format of syslogs.
- Matched "date_time" to "ISO8601".
- Mapped "metadata.event_type" to "USER_LOGIN" and "USER_LOGOUT" for successful authentication and logout events, respectively.
- Mapped "extensions.auth.type" to "AUTHTYPE_UNSPECIFIED"
2025-03-04 Enhancement:
- Added support for a new format of (SYSLOG + KV) logs.
- Mapped "type" to "metadata.product_event_type".
- Mapped "client_mac" to "principal.mac" and "principal.asset.mac".
- Mapped "sequence_id","vap", "band", "channel", "rssi", "aid" and "radio" to "additional.fields".
2025-02-11 Enhancement:
- Added support for a new syslog log format.
2025-01-23 Enhancement:
- Added support for a new syslog log format.
2025-01-02 Enhancement:
- Added support for a new syslog log format.
2024-12-27 Enhancement:
- Added support for a new syslog log format.
2024-11-25 Enhancement:
- Added a Grok pattern to parse new logs.
- Mapped hostname in syslog header to "intermediary.hostname" from "target.hostname".
2024-11-19 Enhancement:
- Added support for a new format of syslog logs.
2024-10-28 Enhancement:
- Added a Grok pattern to parse new logs.
2024-10-24 Enhancement:
- Added a Grok pattern to parse new logs.
2024-10-01 Enhancement:
- Added a Grok pattern to parse new logs.
2024-07-04 Enhancement:
- Added support for a new pattern of syslog logs.
2024-04-02 Enhancement:
- Added a new Grok pattern to parse new log type.
- Mapped the new fields to corresponding UDM fields.
2023-10-04 Enhancement:
- Added a new Grok pattern to parse new log type.
- Mapped "source_facility" to "principal.hostname".
2023-08-11 Enhancement:
- Mapped "intermediary.ip" when message contains "HOST=".
- Mapped "principal.user.userid" when message contains "User:".
- Mapped "principal.process.command_line" when message contains "command:".
- Mapped "target.user.userid" when message contains "username".
- Mapped "metadata.event_type" to a more specific "metadata.event_type".