Reverting breaking change regarding methods with optional parameters

src/DurableTask.Core/Entities/ClientEntityHelpers.cs

@@ -25,6 +25,20 @@ namespace DurableTask.Core.Entities
     /// </summary>
     public static class ClientEntityHelpers
     {
+        /// <summary>
+        /// Create an event to represent an entity signal.
+        /// </summary>
+        /// <param name="targetInstance">The target instance.</param>
+        /// <param name="requestId">A unique identifier for the request.</param>
+        /// <param name="operationName">The name of the operation.</param>
+        /// <param name="input">The serialized input for the operation.</param>
+        /// <param name="scheduledTimeUtc">The time to schedule this signal, or null if not a scheduled signal</param>
+        /// <returns>The event to send.</returns>
+        public static EntityMessageEvent EmitOperationSignal(OrchestrationInstance targetInstance, Guid requestId, string operationName, string? input, (DateTime Original, DateTime Capped)? scheduledTimeUtc)
+        {
+            return EmitOperationSignal(targetInstance, requestId, operationName, input, scheduledTimeUtc, parentTraceContext: null, requestTime: null, createTrace: false);
+        }
+
         /// <summary>
         /// Create an event to represent an entity signal.
         /// </summary>

src/DurableTask.Core/Entities/OrchestrationEntityContext.cs

@@ -219,6 +219,27 @@ public IEnumerable<EntityMessageEvent> EmitLockReleaseMessages()
             }
         }
 
+        /// <summary>
+        /// Creates a request message to be sent to an entity.
+        /// </summary>
+        /// <param name="target">The target entity.</param>
+        /// <param name="operationName">The name of the operation.</param>
+        /// <param name="oneWay">If true, this is a signal, otherwise it is a call.</param>
+        /// <param name="operationId">A unique identifier for this request.</param>
+        /// <param name="scheduledTimeUtc">A time for which to schedule the delivery, or null if this is not a scheduled message</param>
+        /// <param name="input">The operation input</param>
+        /// <returns>The event to send.</returns>
+        public EntityMessageEvent EmitRequestMessage(
+            OrchestrationInstance target,
+            string operationName,
+            bool oneWay,
+            Guid operationId,
+            (DateTime Original, DateTime Capped)? scheduledTimeUtc,
+            string? input)
+        {
+            return EmitRequestMessage(target, operationName, oneWay, operationId, scheduledTimeUtc, input, requestTime: null, createTrace: false);
+        }
+
         /// <summary>
         /// Creates a request message to be sent to an entity.
         /// </summary>