Add products and sales management modules with database schema and validation

- Introduced `ProductsModule` to manage product data, including read and write controllers.
- Created database migrations for the `products`, `sales_requests`, `sales_orders`, `sales_invoices`, and related tables, including constraints and unique indexes.
- Implemented validation for product fields such as code, name, unit, and brand with corresponding utility functions.
- Developed service and repository layers for handling product and sales data operations.
- Added unit tests for the products and sales services, repositories, and controllers to ensure functionality and correctness.
- Updated application module to include the new `ProductsModule` and related sales modules for better organization.

src/common/value-objects/decimal/invalid-decimal.error.ts

@@ -0,0 +1,6 @@
+export class InvalidDecimalError extends Error {
+  constructor() {
+    super('Invalid decimal');
+    this.name = 'InvalidDecimalError';
+  }
+}