Add Stepper motor driver #164

Job	Run time
Unit Test UF2 (ubuntu-latest)	16s
Unit Test Regz (ubuntu-latest)	17s
Unit Test UF2 (windows-latest)	1m 16s
Unit Test Regz (windows-latest)	2m 4s
Unit Test UF2 (macos-latest)	33s
Unit Test Regz (macos-latest)	24s
Build (ubuntu-latest)	24s
Build Website	22s
Build (windows-latest)	1m 17s
Build Examples (espressif/esp)	2m 16s
Dry Run Packaging	1m 16s
Build (macos-latest)	25s
Build Examples (gigadevice/gd32)	2m 10s
Check that stm32 generated code is up to date	39s
Build Examples (microchip/avr)	2m 13s
Unit Test Ports (ubuntu-latest, gigadevice/gd32)	21s
Unit Test Ports (ubuntu-latest, raspberrypi/rp2xxx)	29s
Build Examples (microchip/atsam)	2m 15s
Unit Test Ports (ubuntu-latest, stmicro/stm32)	20s
Build Examples (nordic/nrf5x)	1m 59s
Unit Test Ports (windows-latest, gigadevice/gd32)	1m 31s
Build Examples (nxp/lpc)	2m 2s
Unit Test Ports (windows-latest, raspberrypi/rp2xxx)	56s
Build Examples (stmicro/stm32)	23s
Unit Test Ports (windows-latest, stmicro/stm32)	57s
Build Examples (raspberrypi/rp2xxx)	2m 21s
Unit Test Ports (macos-latest, gigadevice/gd32)	25s
Build Examples (wch/ch32v)	2m 11s
Unit Test Ports (macos-latest, raspberrypi/rp2xxx)	21s
Unit Test Ports (macos-latest, stmicro/stm32)	21s
	32m 44s

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