FR: Locally Expose Services Data

In the UI the [Tailscale Services Beta](https://login.tailscale.com/admin/services) is useful for discovering services available on other devices. I'd like to expose this data locally on a tailscale device using the tailscale API and CLI.

Does it make sense for the [localapi](https://github.com/tailscale/tailscale/blob/main/ipn/localapi/localapi.go) to expose this? And implement the CLI similar to `tailscale status`?

Today using `tailscale.Status(ctx)` to discover the host address and manually hardcoding ports works but having the same data that's available in the UI could make it completely automatic