Xiaomi Mi WiFi Amplifier 2 support

Model name: xiaomi.repeater.v3 (xiaomi.repeater.v1?)

Known methods:

```
miIO.info
miIO.get_repeater_ap_info
miIO.get_repeater_sta_info
miIO.switch_wifi_explorer
miIO.ota
miIO.get_ota_progress
miIO.switch_wifi_ssid
```


