Fix response schemas of actions and functions that return a collection to contain the nextLink property.

Author: millicentachieng

src/Microsoft.OpenApi.OData.Reader/Operation/EdmActionOperationHandler.cs

@@ -35,6 +35,16 @@ protected override void SetRequestBody(OpenApiOperation operation)
         protected override void SetExtensions(OpenApiOperation operation)
         {
             operation.Extensions.Add(Constants.xMsDosOperationType, new OpenApiString("action"));
+            if (Context.Settings.EnablePagination && EdmOperation.ReturnType?.TypeKind() == EdmTypeKind.Collection)
+            {
+                OpenApiObject extension = new OpenApiObject
+                {
+                    { "nextLinkName", new OpenApiString("@odata.nextLink")},
+                    { "operationName", new OpenApiString(Context.Settings.PageableOperationName)}
+                };
+
+                operation.Extensions.Add(Constants.xMsPageable, extension);              
+            }
             base.SetExtensions(operation);
         }
     }

src/Microsoft.OpenApi.OData.Reader/Operation/EdmFunctionOperationHandler.cs

@@ -27,6 +27,16 @@ internal class EdmFunctionOperationHandler : EdmOperationOperationHandler
         protected override void SetExtensions(OpenApiOperation operation)
         {
             operation.Extensions.Add(Constants.xMsDosOperationType, new OpenApiString("function"));
+            if (Context.Settings.EnablePagination && EdmOperation.ReturnType?.TypeKind() == EdmTypeKind.Collection)
+            {
+                OpenApiObject extension = new OpenApiObject
+                {
+                    { "nextLinkName", new OpenApiString("@odata.nextLink")},
+                    { "operationName", new OpenApiString(Context.Settings.PageableOperationName)}
+                };
+
+                operation.Extensions.Add(Constants.xMsPageable, extension);
+            }
             base.SetExtensions(operation);
         }
     }