Change log for JUNIPER_MX

Date	Changes
2024-07-02	Enhancement: - Added new Grok patterns to parse a new pattern of SYSLOGS.
2024-04-15	Enhancement: - Added new Grok patterns to handle a new pattern of SYSLOG logs. - Aligned "target.ip" and "target.asset.ip" mappings. - Aligned "target.hostname" and "target.asset.hostname" mappings. - Aligned "principal.ip" and "principal.asset.ip" mappings. - Aligned "principal.hostname" and "principal.asset.hostname" mappings. - When "metadata.event_type" is "GENERIC_EVENT", and "src_ip" and "dest_ip" is not empty, then set "metadata.event_type" to "NETWORK_CONNECTION". - When "metadata.event_type" is "GENERIC_EVENT", and "src_ip" is not empty, then set "metadata.event_type" to "STATUS_UPDATE".
2023-11-26	Enhancement: - Mapped host sending logs to "intermediary.hostname" instead of "principal.hostname". - Parsed event_type "SSHD_LOGIN_FAILED" and mapped "metadata.event_type" to "USER_LOGIN". - Changed and mapped more appropriate "metadata.event_type' wherever possible.