Add InsertObjectResult class for object insert results

Introduced InsertObjectResult in ReC.Domain.QueryOutput with a required NewObjectId property mapped to the "oGUID" column. This class will be used to represent the result of object insert operations. Added necessary using directive for data annotations.

src/ReC.Domain/QueryOutput/InsertObjectResult.cs

@@ -0,0 +1,9 @@
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace ReC.Domain.QueryOutput;
+
+public class InsertObjectResult
+{
+    [Column("oGUID")]
+    public required long NewObjectId { get; set; }
+}