Driver Request: Create driver for IowaScaledEngineering relay board

[ctacke]

The PCA9671 originally had a driver for the Iowa Scaled Engineering relay board. That specific driver was not commented and did not have a sample so it was removed. A new library with that peripheral needs to be created to restore this capability to MF.

For information, Iowa Scaled Engineering has a fair number of interesting peripherals: https://www.iascaled.com/store/Hobbyist