Add parent trace context information when scheduling an orchestration

src/Abstractions/TaskOptions.cs

@@ -100,4 +100,5 @@ public SubOrchestrationOptions(TaskOptions options, string? instanceId = null)
 /// The time when the orchestration instance should start executing. If not specified or if a date-time in the past
 /// is specified, the orchestration instance will be scheduled immediately.
 /// </param>
-public record StartOrchestrationOptions(string? InstanceId = null, DateTimeOffset? StartAt = null);
+/// <param name="ParentTraceId">Parent Trace Id.</param>
+public record StartOrchestrationOptions(string? InstanceId = null, DateTimeOffset? StartAt = null, string? ParentTraceId = null);

src/Client/Grpc/GrpcDurableTaskClient.cs

@@ -83,6 +83,7 @@
             Version = orchestratorName.Version,
             InstanceId = options?.InstanceId ?? Guid.NewGuid().ToString("N"),
             Input = this.DataConverter.Serialize(input),
+            ParentTraceContext = new P.TraceContext() { TraceParent = options?.ParentTraceId },
         };
 
         DateTimeOffset? startAt = options?.StartAt;