Consider importing `rsconnect.api.RSConnectServer`

[isabelizimm]

For a number of vetiver functions, it is required to import rsconnect.api.RSConnectServer to set up an RSConnect server. It might be nice to import this into vetiver as a courtesy so users do not have to track down how to make this connection in a new package. rsconnect-python is already an installation requirement for vetiver.