Add protocol to "Now listening on" logged at startup

On startup ASP.NET Core will log the addresses it is listening on. `http` vs `https` gives insight into whether the endpoint is secured with TLS. However there is no way to understand what protocols each endpoint supports. It would be useful when debugging connection errors to have an endpoint's protocol logged.

For example:
```console
Now listening on https://localhost:5000 (HTTP/1.1, HTTP/2)
Now listening on http://localhost:5001 (HTTP/2)
```