MicroPython support for ADS123x

[amotl]

As many discussions on https://community.hiveeyes.org/ about the HX711 [1] show, the community is also looking at supporting the ADS123x 24-Bit, Delta-Sigma ADC [2] series for reading the weight scale.

While looking for a solid C library on [3], we found the ADS123X library [4] by @HamidSaffari to be the best one available so far. So, porting this to the ESP-IDF (RTOS) and wrapping it from MicroPython would definitively be nice.

[1] https://community.hiveeyes.org/search?q=hx711
[2] https://community.hiveeyes.org/search?q=ads123
[3] https://community.hiveeyes.org/t/code-fur-ads1232-oder-ads1234/392
[4] https://github.com/HamidSaffari/ADS123X