Changes to Submit New Data License Subscription

added the new Indices enum value to the asset_class/items response property for the response status 200

added the pattern ^[A-Za-z0-9]+$ to the request property name

added the pattern ^[A-Za-z0-9]+$ to the request property provider

added the pattern ^[a-z0-9][a-z0-9-]*\.pdf$ to the request property forms/items/name

the name response's property pattern ^[A-Za-z0-9]+$ was added for the status 200

the provider response's property pattern ^[A-Za-z0-9]+$ was added for the status 200