Add M5Stack AtomS3U

[n3o59hf]

Checklist

By completing this PR sufficiently, you help us to review this Pull Request quicker and also help improve the quality of Release Notes

• [x] Please provide specific title of the PR describing the change
• [x] Please provide related links (eg. Issue which will be closed by this Pull Request)
• [x] If you are adding an new boards, please make sure
  • [x] Provide link to your allocated VID/PID if applicable
  • [x] Add your board to action ci in correct workflow and alphabet order for release binary
  • [x] UF2_BOARD_ID in your board.h follow correct format from uf2 specs

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Description of Change

Add M5Stack AtomS3U board. It is similar to AtomS3 Lite board that is already added and share same controller and basic pinout (button and LED).

USB IDs taken from https://github.com/espressif/usb-pids/blob/60f612f5e2e177104382a009e7b787fc463c18d1/allocated-pids.txt#L400C3-L400C7

Datasheet: https://docs.m5stack.com/en/core/AtomS3U

I am not associated with M5Stack.