Add accels_per_hz as a parameter to `TEST_RESONANCES`

[rogerlz]

Adding this to the backlog as suggested by @lhndo here

lhndo/ResHelper@13cdf5a

[lhndo]

Great to see this @rogerlz !
I have CL with a more standard ACCEL_PER_HZ parameter along with updated documentation for the addition.

lhndo@1c3d69b

[rogerlz]

Thanks!