added 7 apis of products and categories as assignment

[Vishal70854]

Implemented all the below mentioned api's with DB calls. I would like to hear back from you for any sort of improvement in my code.

// abstract method for create product
GenericProductDto createProduct(GenericProductDto product);

// abstract method for get product by id
GenericProductDto getProductById(UUID id) throws NotFoundException;

// get all products
List<GenericProductDto> getAllProducts();

// abstract method to delete product by id
GenericProductDto deleteProductById(UUID id);

// abstract method for update product by id
GenericProductDto updatePrductById(GenericProductDto genericProductDto,UUID id);

// get all categoris of a type
List<ProductDto> getCategoryById(String categoryName);

List<String> getAllCategories();


Kindly review the code and let me know if any changes needed.
Also I am feeling confident as I have implemented all on my own. Thanks to you for that Naman