Add domain buying and management support in deno deploy

### What problem are you trying to solve?

Only lack in deno deploy is now domain management, like buying a new domain and maintain it's dns, etc

### Describe the solution you'd like

It would be nice if we can buy new domains from deno deploy console only.
It will help developers to iterate faster.
It can increase revenue for deno company also.
This feature will help to frame deno deploy as complete edge cloud solutions also.

### Describe alternatives you've considered

Currently developers are struggling to maintain domains after google domains shut down and alternatives are not that much reliable like go daddy and other domain providers.

### Documentation, Adoption, Migration Strategy

_No response_