Add Stepper motor driver #144

Job	Run time
Unit Test Regz (ubuntu-latest)	18s
Unit Test UF2 (ubuntu-latest)	18s
Unit Test Regz (windows-latest)	1m 47s
Unit Test UF2 (windows-latest)	2m 22s
Build (ubuntu-latest)	23s
Build Examples (espressif/esp)	2m 17s
Unit Test UF2 (macos-latest)	31s
Unit Test Regz (macos-latest)	30s
Build (windows-latest)	2m 16s
Build Examples (gigadevice/gd32)	2m 16s
Build (macos-latest)	29s
Build Examples (microchip/avr)	2m 23s
Build Examples (microchip/atsam)	2m 0s
Build Website	20s
Dry Run Packaging	1m 20s
Build Examples (nordic/nrf5x)	2m 2s
Check that stm32 generated code is up to date	40s
Build Examples (nxp/lpc)	1m 59s
Build Examples (stmicro/stm32)	18s
Unit Test Ports (ubuntu-latest, gigadevice/gd32)	24s
Unit Test Ports (ubuntu-latest, raspberrypi/rp2xxx)	27s
Unit Test Ports (ubuntu-latest, stmicro/stm32)	20s
Build Examples (raspberrypi/rp2xxx)	2m 20s
Unit Test Ports (windows-latest, gigadevice/gd32)	1m 43s
Build Examples (wch/ch32v)	2m 11s
Unit Test Ports (windows-latest, raspberrypi/rp2xxx)	1m 13s
Unit Test Ports (windows-latest, stmicro/stm32)	1m 26s
Unit Test Ports (macos-latest, gigadevice/gd32)	30s
Unit Test Ports (macos-latest, raspberrypi/rp2xxx)	36s
Unit Test Ports (macos-latest, stmicro/stm32)	24s
	36m 3s

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