Adding esp32s3 XIAO pinout

[joshuacox]

Description

Adding esp32s3 XIAO pinout, and placing the pinouts in a separate header file in the hopes that someone else can utilize the same pinout header file in their project.

Related

possibly anyone with an esp32s3 xiao board who gets the Detected camera not supported error message.

Testing

I have one of these boards, and I did test with the definition changed at the top of take_picture.c:

#define BOARD_ESP32S3_XIAO

I can change that back if you like.

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Checklist

Before submitting a Pull Request, please ensure the following:

• 🚨 This PR does not introduce breaking changes.
• All CI checks (GH Actions) pass.
• Documentation is updated as needed.
• Tests are updated or added as necessary.
• Code is well-commented, especially in complex areas.
• Git history is clean — commits are squashed to the minimum necessary.

[joshuacox]

that commit should resolve those reviews. Let me know if there is anything else.