Change log for SECURELINK

Date	Changes
2023-09-13	Enhancement: - Added a Grok pattern to parse syslog logs. - Mapped "msg" to "metadata.description". - Mapped "dst_ip" to "target.ip". - Mapped "src_ip" to "principal.ip". - Mapped "proto" to "network.ip_protocol". - Mapped "priority" to "security_result.severity_details". - Mapped "classification" to "additional.fields". - Mapped "url" to "target.url".
2023-08-09	Bug-Fix: - Modified Grok pattern to parse the "key" field.
2022-07-13	Enhancement: - Modified grok pattern to parse "systemd", "journal", "sshd", "sudo", "su", "CROND", "suricata", "ntpd", "kernel", "suricata-config", "stunnel" logtypes. - Changed metadata.event_type from "GENERIC_EVENT" to "STATUS_UPDATE" where principal.hostname is not null. - Changed metadata.event_type from "GENERIC_EVENT" to "USER_UNCATEGORIZED" where target.user.userid is not null.