Add Support for Seeed Studio ESP32C6

[robd003]

https://wiki.seeedstudio.com/xiao_esp32c6_getting_started/

https://www.seeedstudio.com/Seeed-Studio-XIAO-ESP32C6-p-5884.html

Just getting basic support for the board to start would be great.

Adding support for Matter / Thread later would be appreciated.

[austindrenski]

Would be great to see this finally added. Several options, including the recent PR #1472 from @lucaskatayama, and an older PR #1380 from @LynnL4.

[chrisinnovationlab]

I would also love to see SEEED XIAO added. Do you know how long this could take or where this feature is ranked in the backlog?