[REQUEST] Add RATTM and MotionKing Motors

[epoxi]

@andrewmcgr
Please add these motors to the repo:

[motor_constants rattm-17HS8401]
# https://www.aliexpress.com/item/517614158.html
resistance: 1.8
inductance: 0.0032
holding_torque: 0.52
max_current: 1.8
steps_per_revolution: 200

[motor_constants motionking-17H2A8417]
# https://www.motionking.com/Products/Hybrid_Stepper_Motors/2-phase/17H2A_Stepper_Motor_42mm_1.8degree.htm
resistance: 1.8
inductance: 0.0032
holding_torque: 0.52
max_current: 1.7
steps_per_revolution: 200

[epoxi]

@andrewmcgr is it possible to add these motors to the db?

I think nothing is missing.