FBM320 and MAG3110 update to ESP32 Azure IoT Kit Example (AEGHB-364)

[serenagrl]

Hi.

Enclosed are the implementation of the FBM320 and MAG3110 drivers for the ESP32 Azure IoT Kit example. Please review and consider merging it to the master.

Thank You

[CLAassistant]

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[wolfeidau]

@serenagrl love your work, I am using this PR with some success in my own project.

Thanks for taking the time to build this!