Adapt to HA 2022.2

[toreamun]

• Use SensorEntityDescription
• Use Platform consts
• Python 3.9 minimum version
• Use hw_version ref. https://github.com/home-assistant/core/pull/61650
• Switch to async_setup_platforms and async_unload_platforms

[toreamun]

https://github.com/toreamun/victorsmartkill-homeassistant/releases/tag/2022.2.1