feat: Update the product options model and refactor the product module (#6685)

The changes in this PR are:
1. Change how product options are created and stored. The relationship changed from
`options --> option values <-- variants`
to
`options --> option values --> variant options <-- variants`

Now we can enforce non-duplicate option values, easier creation and updates of options, and more.

2. Refactors the product module. The product module did a lot of things in a non-ideal approach, and this is a step towards a more consistent usage of the base repository and methods exposed by a module. There is still work left to improve the module, but a large chunk of the changes are included in this PR


Things to do as a follow-up:
1. Remove many-to-many relationships  if an empty list is passed in the base repository.
2. Improve the typings of the module
3. Further cleanup and improvements (there are few questions that I need answered before I can improve the API)

packages/product/integration-tests/__fixtures__/product/data/create-product.ts

@@ -48,7 +48,9 @@ export const buildProductAndRelationsData = ({
   variants,
   collection_id,
 }: Partial<ProductTypes.CreateProductDTO>) => {
-  const defaultOptionTitle = faker.commerce.productName()
+  const defaultOptionTitle = "test-option"
+  const defaultOptionValue = "test-value"
+
   return {
     title: title ?? faker.commerce.productName(),
     description: description ?? faker.commerce.productName(),
@@ -64,17 +66,16 @@ export const buildProductAndRelationsData = ({
     options: options ?? [
       {
         title: defaultOptionTitle,
+        values: [defaultOptionValue],
       },
     ],
     variants: variants ?? [
       {
         title: faker.commerce.productName(),
         sku: faker.commerce.productName(),
-        options: [
-          {
-            value: defaultOptionTitle + faker.commerce.productName(),
-          },
-        ],
+        options: {
+          [defaultOptionTitle]: defaultOptionValue,
+        },
       },
     ],
     // TODO: add categories, must be created first