This commit enhances the stocks module by adding new import modules, implementing more stock related endpoints and methods, and creating a new dto for stock data validation. The stocks service now includes methods to get a product's stock, create, alter, get the current stock, rank products by stock, get all stocks, decrement and increment product stock. StocksController now holds endpoints to add a new stock, get products with more or less stock, edit a stock, and get a stock of a specific product.
This commit introduces new nest.js modules for stocks, transactions and products, along with their respective services and controllers. These provide foundation for further feature development in these areas.
