pass sensor dimension flags to analytics (#4954)

com.unity.ml-agents/Runtime/Analytics/Events.cs

         public static EventObservationSpec FromSensor(ISensor sensor)
         {
             var shape = sensor.GetObservationShape();
+            var dimProps = (sensor as IDimensionPropertiesSensor)?.GetDimensionProperties();
-                // TODO copy flags when we have them
+                dimInfos[i].Flags = dimProps != null ? (int)dimProps[i] : 0;
             }
 
             var builtInSensorType =

com.unity.ml-agents/Tests/Editor/Analytics/InferenceAnalyticsTests.cs

             Assert.AreEqual(2, continuousEvent.ObservationSpecs.Count);
             Assert.AreEqual(3, continuousEvent.ObservationSpecs[0].DimensionInfos.Length);
             Assert.AreEqual(20, continuousEvent.ObservationSpecs[0].DimensionInfos[0].Size);
+            Assert.AreEqual((int)DimensionProperty.TranslationalEquivariance, continuousEvent.ObservationSpecs[0].DimensionInfos[0].Flags);
+            Assert.AreEqual((int)DimensionProperty.None, continuousEvent.ObservationSpecs[0].DimensionInfos[2].Flags);
             Assert.AreEqual("None", continuousEvent.ObservationSpecs[0].CompressionType);
             Assert.AreEqual(Test3DSensor.k_BuiltInSensorType, continuousEvent.ObservationSpecs[0].BuiltInSensorType);
             Assert.AreNotEqual(null, continuousEvent.ModelHash);

com.unity.ml-agents/Tests/Editor/ParameterLoaderTest.cs

             return Sensor.GetObservationShape();
         }
     }
-    public class Test3DSensor : ISensor, IBuiltInSensor
+    public class Test3DSensor : ISensor, IBuiltInSensor, IDimensionPropertiesSensor
     {
         int m_Width;
         int m_Height;
         public BuiltInSensorType GetBuiltInSensorType()
         {
             return (BuiltInSensorType)k_BuiltInSensorType;
+        }
+
+        public DimensionProperty[] GetDimensionProperties()
+        {
+            return new[]
+            {
+                DimensionProperty.TranslationalEquivariance,
+                DimensionProperty.TranslationalEquivariance,
+                DimensionProperty.None
+            };
         }
     }