Add better step telemetry and tracing for composite Actions (#1229)

* Add Step Telemetry

* better telemetry and tracing

* cleanup

src/Sdk/DTWebApi/WebApi/ActionsStepTelemetry.cs

@@ -0,0 +1,36 @@
+using System.Runtime.Serialization;
+
+namespace GitHub.DistributedTask.WebApi
+{
+    /// <summary>
+    /// Information about a step run on the runner
+    /// </summary>
+    [DataContract]
+    public class ActionsStepTelemetry
+    {
+
+        [DataMember(EmitDefaultValue = false)]
+        public string Ref { get; set; }
+
+        [DataMember(EmitDefaultValue = false)]
+        public string Type { get; set; }
+
+        [DataMember(EmitDefaultValue = false)]
+        public bool? HasRunsStep { get; set; }
+                
+        [DataMember(EmitDefaultValue = false)]
+        public bool? HasUsesStep { get; set; }
+
+        [DataMember(EmitDefaultValue = false)]
+        public bool IsEmbedded { get; set; }
+
+        [DataMember(EmitDefaultValue = false)]
+        public bool? HasPreStep { get; set; }
+
+        [DataMember(EmitDefaultValue = false)]
+        public bool? HasPostStep { get; set; }
+
+        [DataMember(EmitDefaultValue = false)]
+        public int? StepCount { get; set; }
+    }
+}