implement osis actor

examples/scripts/sale.rhai

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+// sale.rhai
+
+// Create a sale item
+let sale_item = new_sale_item()
+    .product_id(1)
+    .name("Super Product")
+    .quantity(2)
+    .unit_price(99.99)
+    .subtotal(199.98)
+    .service_active_until(1735689600); // Future timestamp
+
+print("New Sale Item:");
+print(sale_item);
+
+// Create a sale and add the item
+let new_sale = new_sale()
+    .company_id(1)
+    .buyer_id(2)
+    .transaction_id(12345)
+    .total_amount(199.98)
+    .status("Completed")
+    .sale_date(1672531200) // Past timestamp
+    .add_item(sale_item)
+    .notes("This is a test sale.")
+    .save_sale();
+
+print("\nNew Sale:");
+print(new_sale);