Change log for ZSCALER_ZPA

Date Changes
2024-05-20 Enhancement:
- Mapped "Hostname" to "principal.hostname".
- Mapped "TotalBytesRx" to "network.received_bytes".
- Mapped "TotalBytesTx" to "network.sent_bytes".
- Mapped "SessionStatus" to "InternalReason" to map event types based on "SessionStatus".
- Mapped "Platform" to "principal.platform".
- Mapped "Version" to "metadata.product_version".
- Mapped "CertificateCN" to "additional.fields".
- Mapped "Latitude" to "principal.location.region_latitude" and "principal.location.region_coordinates.latitude".
- Mapped "Longitude" to "principal.location.region_longitude" and "principal.location.region_coordinates.longitude".
2024-02-12 Enhancement
- Removed drop tag to parse unsupported log.
2023-02-22 Newly created parser.