Add Schema for FSSBodySignals

[NoFoolLikeOne]

This event is very similar to SAASignalsFound except it doesn't contain Human/Thargiod/Guardian Signals

It is generated when a Body is FSS scanned if it has biology or geology which makes it handy because you can identify Bio/Geo signals without having to Surface Scan

{
  "timestamp": "2021-11-09T22:14:59Z",
  "event": "FSSBodySignals",
  "BodyName": "HIP 49122 3 b",
  "BodyID": 26,
  "SystemAddress": 766408427867,
  "Signals": [
    {
      "Type": "$SAA_SignalType_Biological;",
      "Type_Localised": "Biological",
      "Count": 1
    }
  ]
}

It would need to be augmented with systemName and Coordinates

[NoFoolLikeOne]

I presume eventually there will be a SAASignalsFound scheme instead of lumping it in the journal schema so the PR could contain both schemas