Add positional typed multi-table SQL contexts

DynamORM.Tests/Helpers/TypedMultiJoinModels.cs

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+/*
+ * DynamORM - Dynamic Object-Relational Mapping library.
+ * Copyright (c) 2012-2026, Grzegorz Russek (grzegorz.russek@gmail.com)
+ * All rights reserved.
+ */
+
+using DynamORM.Mapper;
+
+namespace DynamORM.Tests.Helpers
+{
+    [Table(Name = "UserRoles", Owner = "dbo")]
+    public class TypedJoinUserRole
+    {
+        [Column("Role_Id", true)]
+        public long RoleId { get; set; }
+
+        [Column("User_Id")]
+        public long UserId { get; set; }
+
+        [Column("Role_Name")]
+        public string RoleName { get; set; }
+    }
+
+    [Table(Name = "UserRegions", Owner = "dbo")]
+    public class TypedJoinUserRegion
+    {
+        [Column("Region_Id", true)]
+        public long RegionId { get; set; }
+
+        [Column("User_Id")]
+        public long UserId { get; set; }
+
+        [Column("Region_Code")]
+        public string RegionCode { get; set; }
+    }
+}