Support for Programmatic Plumber API

Some of plumber API implementation is complicated using programmatic Plumber like code snip example below, is there a way to run faucet to host the API and configure load balance? 

```
pr() |>
  pr_get("/", function(){
    "<html><h1>Programmatic Plumber!</h1></html>"
  }, serializer = plumber::serializer_html()) |>
  pr_run()
```