Change log for GCP_APP_ENGINE

Date Changes
2024-08-01 - If principal machine data is present, then set "metadata.event_type" to "STATUS_UPDATE".
- Mapped "protoPayload.ip" to "principal.ip" and "principal.asset.ip".
- Mapped "protoPayload.appId" to "principal.resource.attribute.labels".
- Mapped "protoPayload.host" to "principal.hostname".
- Mapped "protoPayload.method" to "network.http.method".
- Mapped "protoPayload.@type" , "labels.clone_id" and "operation.producer" to "additional.labels".
2024-06-03 - Added support for a new type of JSON logs.
2024-03-05 - Newly created parser.