[Feature request] Redesign board to add an ADXL345

I request a change to the board design to incorporate an ADXL345 in addition to the levelling sensor. As far as I can tell, no combined levelling and vibration tuning sensor exists. The Eddy is ideally placed to also measure vibration for input shaping. A combined sensor would be a real game changer for me

No files, tests, or entry points are named. Begin by locating the board design and levelling-sensor implementation, then determine how an ADXL345 could be incorporated alongside it; done means a reviewed board design that supports both levelling and vibration measurement.

Written by the indexing model from the issue text.