Create /stock endpoints

[rexchoppers]

• Add permission resource in Keycloak
• GET /stock (Get all stock entries)
• GET /stock/:uuid (Get single stock entry)
• GET /stock/warehouse/:uuid (Get stock for a specific warehouse)

This /stock endpoint will pull high-level information from the stock table. This is simply a count of stock in a warehouse for that SKU

• Stock endpoint will return all stock grouped by warehouse ID