Some commands in the Serve CLI use Ray client and some commands ping the Ray dashboard; however, all commands read `RAY_ADDRESS` to get the address. This change raises a nice exception if the user accidentally passes a Ray client address as the Ray Dashboard address.
The `py_modules` field of runtime_env supports uploading local Python modules for use on the Ray cluster. One gap in this is if the local Python module is in the form of a wheel (`.whl` file.) This PR adds the missing support for uploading and installing the `.whl` file.
