ADC - HX711 Component

[SquaredPotato]

This component should provide easy access to the strain sensor readouts. Support already exists in the esp-idf-lib so this should be a simple wrapper.

This component should also have a means to calibrate the readout.

Perhaps it's better to present the strain sensor as a "button" with multiple press actions, like

enum strain_state {
    idle,
    press,
    press_hard
}

class xxx {
public:
    strain_state get_strain_state();
}

[abrondijk]

Issue is on-halt until we have revision 3 of the hardware. Revision 2 was mistakenly ordered in the wrong PCB thickness, so any strainsensor values are not representative.