[Midea Climate] Support display on/off commands via UART

**Describe the problem you have/What new integration you would like**
I would like to add support for turning the Midea AC display on and off via UART in the `climate.midea` component. My AC supports this feature using the Midea USB dongle, and midea-ac-py can successfully toggle the display using UART commands. However, ESPHome does not currently expose this capability.

**Please describe your use case for this integration and alternatives you've tried:**
My use case is to turn off the display panel of the indoor unit to reduce light pollution at night. I have confirmed that the AC supports this via UART using midea-ac-py, but ESPHome does not provide this function yet. Alternatives like IR are not ideal because I am using the Midea USB dongle for full control.

**Additional context**
- Midea mini split with original Midea USB dongle
- Display on/off confirmed working over UART using midea-ac-py
- ESPHome climate.midea does not support sending display commands yet

It would be great to expose `display_on` and `display_off` in ESPHome for consistency.

Thanks for your work!