Add compatability and auto-detection for the Cubic PM1006 air quality sensor

[brentru]

This pull request adds compatibility for this library to work with the Cubic PM1006 LED Particle Sensor. This sensor is used in the IKEA VINDSTRYKKA.

• Adds auto-detection for start-bytes to differentiate between the sensors
• Modifies Adafruit_PM25AQI::read() to work with Adafruit's Air Quality Sensors or the Cubic PM1006
• Added a demo sketch, PM1006_test.ino, to show usage
• Note that this sensor doesn't have I2C and can only read PM 25 Environmental values. As a result, it can't write into all the members of the PM25_AQI_Data struct. Therefore, only the checksum and pm25_env values are written into this struct.

Tested on hardware with:

• "Hacked" IKEA VINDSTRYKKA connected to an Adafruit QTPY ESP32 over UART
  • Using PM1006_test.ino sketch
• Feather ESP32-S3 connected to a PM2.5 Air Quality Sensor and Breadboard Adapter Kit - PMS5003 over UART.
  • Using pm25_test.ino sketch.

[tyeth]

Tested on metro-s2, it was not behaving as I'd expect (with no prior knowledge), the Ikea board appears to ask the sensor for 5 readings and then sleeps for 20seconds before another set of readings. As we are just passively monitoring this sensor rather than initiating readings I think this is the best we can hope for.
Added prints (was hoping to peek at bad bytes), but it was just serial unavailable during those times which I guess is fair enough.

[brentru]

the Ikea board appears to ask the sensor for 5 readings and then sleeps for 20seconds before another set of readings. As we are just passively monitoring this sensor rather than initiating readings I think this is the best we can hope for.

Yeah, the sleep period of the sketch in the demo (https://github.com/Hypfer/esp8266-vindriktning-particle-sensor) was 30 seconds. We could sleep for this duration but the actual code is monitoring the sensor as readings are initiated by the MCU on the ikea sensor's mainboard.

[brentru]

After discussing with @tyeth on slack, I've changed the sampling interval to every 5 seconds. We also now wait 20 seconds between successful reads.

[caternuson]

Did not test, but LGTM.