add dfrobot_esp32_s3_ai_cam board (AUD-6451)

[wxzed]

add dfrobot esp32s3 ai cam

Description

This PR adds support for the DFRobot ESP32-S3 AI Camera board.

Related

Product link: https://www.dfrobot.com/product-2899.html

Testing

Tested the pipeline_play_sdcard_music example on the new DFRobot ESP32-S3 AI Cam board.

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Checklist

Before submitting a Pull Request, please ensure the following:

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

[CLAassistant]

All committers have signed the CLA.