Implemented GET, POST, PUT, and DELETE endpoints for the `/inventory` resource. These endpoints provide full CRUD functionality, handling operations such as retrieval, creation, update, and deletion of inventory items in the database. Adds appropriate error handling for cases where inventory items are not found.
Renamed `inventoryModel.cs` to `barkDbModel.cs` and refactored the context class from `InventoryContext` to `BarkContext`. Consolidated inventory item properties into a new `InventoryItems` class for better organization and future scalability.