Prescence of WiFi network as a binary sensor

**Describe the problem you have/What new integration you would like**

I would like to have my ESP to continuously scan for available WiFi networks and let me expose binary sensors reflecting if a particular SSID is present. I.e. if I specify SSID "Hello" and every 30s a scan is performed and if "Hello" is available, the sensor is set to true, otherwise false. Perhaps with some filtering (must be unavailable X times in a row before setting to false).

**Please describe your use case for this integration and alternatives you've tried:**

I have a OBD2 dongle in my car that I want to use as a prescence detection. The dongle itself gets power even when the car is off, men it's not possible to communicate with the car.

**Additional context**

Maybe it's interesting to reveal information about arbitrary WiFi access points as well? Signal strength and such.

I'm not sure if the ESP allows for scanning like this when connected to an AP, but if it does it's something I'd really want to have.