Support download FaultLog data: CPER

Redfish APIs :
  /redfish/v1/Manages/bmc/LogServices/FaultLog/Entries/1

{
  "@odata.id": "/redfish/v1/Managers/bmc/LogServices/FaultLog/Entries/1",
  "@odata.type": "#LogEntry.v1_11_0.LogEntry",
  "AdditionalDataSizeBytes": 104,
  "AdditionalDataURI": "/redfish/v1/Managers/bmc/LogServices/FaultLog/Entries/1/attachment",
  "Created": "2024-12-19T21:48:13.912126+00:00",
  "DiagnosticDataType": "CPER",
  "EntryType": "Event",
  "Id": "1",
  "Name": "FaultLog Dump Entry"
}

Signed-off-by: John Chung <john.chung@arm.com>
Change-Id: I1a22e74edc64314ab7777355d53e7fb70309ec79