Add support for Z axis measurements

[strayr]

Z axis support

This is particularly interesting for belted Z printers and particularly CoreXZ that are capable of quite quick Z motions and whilst there is very little Z motion (mostly bed mesh compensation) during printing, a fast z-hop can ring after the motion has completed and an XY print motion has started. For intricate models - Eiffel Tower springs to mind, but minis with fine features and small supports are my use case - fast z-hops really improve the print speed and reliability.

See:

• https://www.klipper3d.org/Measuring_Resonances.html#measuring-the-resonances-of-z-axis
• https://klipper.discourse.group/t/feature-testing-z-axis-input-shaper/24886

[HaskiDoggo]

I support this