add multi instance query support logics

src/DurableTask.AzureStorage/AzureStorageOrchestrationService.cs

@@ -1923,13 +1923,7 @@ private static OrchestrationQueryResult ConvertFrom(DurableStatusQueryResult sta
                 results.Add(state);
             }
 
-            var result = new OrchestrationQueryResult
-            {
-                OrchestrationState = results,
-                ContinuationToken = statusContext.ContinuationToken,
-            };
-
-            return result;
+            return new OrchestrationQueryResult(results, statusContext.ContinuationToken);
         }
 
         class PendingMessageBatch

src/DurableTask.Core/Query/OrchestrationQuery.cs

@@ -10,14 +10,12 @@
 //  See the License for the specific language governing permissions and
 //  limitations under the License.
 //  ----------------------------------------------------------------------------------
-
-using System;
-using System.Collections.Generic;
-
 #nullable enable
-
 namespace DurableTask.Core.Query
 {
+    using System;
+    using System.Collections.Generic;
+
     /// <summary>
     /// Query condition for searching the status of orchestration instances.
     /// </summary>

src/DurableTask.Core/Query/OrchestrationQueryResult.cs

@@ -11,25 +11,35 @@
 //  limitations under the License.
 //  ----------------------------------------------------------------------------------
 
-using System.Collections.Generic;
-
 namespace DurableTask.Core.Query
 {
+    using System.Collections.Generic;
+
     /// <summary>
     /// The status of all orchestration instances with paging for a given query.
     /// </summary>
     public class OrchestrationQueryResult
     {
         /// <summary>
-        /// Gets or sets a collection of statuses of orchestration instances matching the query description.
+        /// Constructor of OrchestrationQueryResult Class.
+        /// </summary>
+        /// <param name="OrchestrationState">A collection of orchestration instance status values.</param>
+        /// <param name="ContinuationToken">A server-generated continuation token or <c>null</c> if there are no further continuations.</param>
+        public OrchestrationQueryResult(IReadOnlyCollection<OrchestrationState> OrchestrationState, string ContinuationToken)
+        {
+            this.OrchestrationState = OrchestrationState;
+            this.ContinuationToken = ContinuationToken;
+        }
+        /// <summary>
+        /// Gets a collection of statuses of orchestration instances matching the query description.
         /// </summary>
         /// <value>A collection of orchestration instance status values.</value>
-        public IEnumerable<OrchestrationState> OrchestrationState { get; set; }
+        public IReadOnlyCollection<OrchestrationState> OrchestrationState { get; }
 
         /// <summary>
-        /// Gets or sets a token that can be used to resume the query with data not already returned by this query.
+        /// Gets token that can be used to resume the query with data not already returned by this query.
         /// </summary>
         /// <value>A server-generated continuation token or <c>null</c> if there are no further continuations.</value>
-        public string ContinuationToken { get; set; }
+        public string ContinuationToken { get; }
     }
 }