Change log for ZSCALER_ZPA

Date	Changes
2024-10-01	Enhancement: - Mapped "PosturesHit", "PosturesMiss", "TimestampConnectionStart", "TimestampConnectionEnd", "TimestampCATx", "TimestampCATRx", "TimestampAppLearnStart", "TimestampZENFirstRxClient", "TimestampZENFirstTxClient", "TimestampZENLastRxClient", "TimestampZENLastTxClient", "TimestampConnectorZENSetupComplete", "TimestampZENFirstRxConnector", "TimestampZENFirstTxConnector", "TimestampZENLastRxConnector", "TimestampZENLastTxConnector", "ZENBytesRxClient", "ZENBytesTxClient", "ZENTotalBytesRxConnector", "ZENBytesRxConnector", "ZENTotalBytesTxConnector", and "ZENBytesTxConnector" to "additional.fields".
2024-07-09	Enhancement: - If "has_principal" and "has_target" are "true" and "metadata.event_type" is "GENERIC_EVENT", then set "metadata.event_type" to "NETWORK_CONNECTION".
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.