Add ssltransport for robovacs (#943)

This PR implements a clear-text, token-based transport protocol seen on
RV30 Plus (#937).

- Client sends `{"username": "email@example.com", "password":
md5(password)}` and gets back a token in the response
- Rest of the communications are done with POST at `/app?token=<token>`

---------

Co-authored-by: Steven B. <51370195+sdb9696@users.noreply.github.com>

kasa/cli/main.py

@@ -308,6 +308,7 @@ async def cli(
         if type == "camera":
             encrypt_type = "AES"
             https = True
+            login_version = 2
             device_family = "SMART.IPCAMERA"
 
         from kasa.device import Device