[miio] add channel for is_locating

[tommycw1]

I have an S4Max robot and take it from floor to floor. When it is determining which map is the correct map for the floor it is on, the vacuum says "Positioning" and once it figures out where it is is says "Position established"

2021-02-02 11:08:49.290 [DEBUG] [internal.handler.MiIoAbstractHandler] - Received response for 63c691d1 type: GET_STATUS, result: [{"msg_ver":2,"msg_seq":1949,"state":5,"battery":69,"clean_time":1310,"clean_area":22020000,"error_code":0,"map_present":1,"in_cleaning":1,"in_returning":0,"in_fresh_state":0,"lab_status":3,"water_box_status":0,"fan_power":103,"dnd_enabled":0,"map_status":3,"is_locating":0,"lock_status":0}],"exe_time":100}

I can see the "Is_locating" JSON response (above) to the GET_STATUS command in debug logs and see it change between 1 and 0 in correlation to whether or not the vacuum is determining its position. I would like to use the variable trigger my rule that used actionCommand.sendCommand("get_room_mapping") and parses the output to figure out what floor it is on.

Can this be added as a channel available?

[openhab-bot]

This issue has been mentioned on openHAB Community. There might be relevant details there:

https://community.openhab.org/t/xiaomi-roborock-room-clean-multi-level-map/108850/15