1. Proposed title of this feature request
BGP Advertisement of Primary UDNs

2. What is the nature and description of the request?
Right now it is only possible to do BGP Advertisement through admin controlled CUDNs.

We would like to expose BGP Advertisement for UDNs as well, with additional safe guards that allow the cluster admin to control or limit the subnets that are allowed for advertisement via the RouteAdvertisements versus a broad networkSelector.

3. Why does the customer need this? (List the business requirements here)
Leveraging the ability to create 1 or more UDNs per namespace, this allows for a tighter control and allocation of address space while providing the capability and control over advertisement into the provider network routing table.

4. List any affected packages or components.