Add action - Restock the inventory

[ShiweiHe0713]

As a inventory manager I need to be able to restock the inventory So that the manager can restock the inventory

Details and Assumptions

Add a restock_amount field, and then when stock level is getting lower than a threshold, we can automatically/manually make a PUT request to increase the stock level by restock_amount.

• A restock_amount field will be added to each product in the inventory system.
• When the stock level of a product falls below a predefined threshold, the system can automatically or manually trigger a - PUT request to increase the stock level by the restock_amount. [Below Optional]
• The system should allow the manager to configure the threshold and restock_amount for each product.
• Managers should be able to initiate manual restocking even if the stock level has not reached the threshold.

• Confirmation or error messages will be provided based on the success or failure of the restocking action.

  Acceptance Criteria

  
  Scenario: Automatic restocking when stock falls below threshold
  Given a product has a defined `restock_amount` and restock threshold
  And the current stock level falls below the threshold
  When the system detects the low stock level
  Then the system will automatically make a `PUT` request to increase the stock by the `restock_amount`
  And the inventory level will be updated
  And a notification will be sent to confirm the restock