Numpy is missing from the klipper install

[eliasbakken]

Numpy is needed to do adxl345 measurements, but it is not installed by default.

A worksround is tun run: /home/debian/klippy-env/bin/pip install numpy

[goeland86]

Maybe create a small utility script for those who want to install adxl345 support in the klipper repository's scripts folder? I believe upstream klipper will have the same possible issue.

[shuffleznl]

There are some other dependencies too which aren't in Refactor by default iirc: https://www.klipper3d.org/Measuring_Resonances.html

[eliasbakken]

Merged in main