Stores achieved general availability status

After collecting feedback during the beta phase, we have moved Stores out of beta. The status of the following features has been changed to general availability:

• Creating and managing Stores
• Custom fields on Stores
• Stores on Carts, Orders, Customers, and Shopping Lists
• Store-based OAuth scopes for orders, customers, and Shopping Lists
• Store-based Product Projection dimensions for filtering of locales, prices, and inventory based on Store settings.

In addition, to support use cases requiring a high number of Stores we have increased the limit on the number of Stores in a Project from 500 to 50000.