Store reverse charge status

[JustShah]

Description:
This PR introduces the reverse_charge_status functionality to the Store model, allowing users to manage and select the reverse charge status for each store. The changes include:

1. Store Model Update:

   • Introduced a new enum reverse_charge_status to the Store model.
   • This enum allows the store's reverse charge status to be set to one of the following values:
     • enabled
     • disabled
     • not validated

2. API Support:

   • API endpoints for store management have been updated to support the newly added reverse_charge_status.
   • The attribute can now be accessed and modified through existing store APIs.

3. Admin Form Update:

   • The store admin form has been updated to include a dropdown for selecting the reverse charge status.
   • Users can now easily select the desired charge status when managing a store.