Add SaraKIT CM4 board for robotics, voice, motor control

[geerlingguy]

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The SaraKIT is a CM4 carrier board "with ChatGPT-based voice control, motor control, powerful sensors, and tons of tutorials"

Their demo video shows off a lot of uses, like an RC car controllable by voice, an object-following robot, a self-balancing two-wheel robot, and more... a few of the demos they highlight seem to blur the line between 'what could be' and 'what is', however—having very smooth motor control to follow a face seems like it might require more finesse than what's possible using the BCM2711 to do all the processing.