Change log for CHECKPOINT_FIREWALL

Date Changes
2022-06-30 Enhancement:
- Mapped "message_info" to "metadata.description".
2022-06-17 Enhancement:
- Added conditional checks for fields "nat_rulenum", "rule", "sent_bytes", "received_bytes", "s_port", "service".
- Modified event_types for the following cases:
- "GENERIC_EVENT" to "NETWORK_CONNECTION" where "principal.ip or principal.hostname" and "target.ip or target.hostname" are not null.
- "GENERIC_EVENT" to "STATUS_UNCATEGORIZED" where "principal.ip or principal.hostname" is not null.
2022-06-14 Enhancement:
- Modified the parser to parse more logs by removing the condition check for passwd.
2022-06-07 Enhancement:
- Mapped src_machine_name to security_result.detection_fields.
2022-05-19 Enhancement:
- Mapped inzone, outzone, layer_name, layer_uuid and policy_name to security_result.detection_fields.
- Mapped service_id to principal.application.