Added Xiao S3 variant

[IoTThinks]

This is for Xiao S3 and a normal Wio SX1262 for Xiao shield.

• Xiao S3: https://www.seeedstudio.com/XIAO-ESP32S3-p-5627.html
• Wio SX1262 for Xiao: https://www.seeedstudio.com/Wio-SX1262-for-XIAO-p-6379.html

Tested works fine (repeater and BLE companion) for two PowerSaving realeases.
PS: This is not a Xiao S3 Wio combo. The pin mappings are different (especially the mapping to DIO1).

[Sodium-Hydrogen]

My 2¢ input as someone who also is running a Xiao S3 with the WIO shield is; I like this and you beat me to opening a PR.

But instead of adding it as a new variant, why not add it as a sub variant of the already existing Xiao S3? (see Xiao C6 for example)

The Xiao that is already supported is a Xiao S3 with a populated B2B connector that doesn't use the D pins. They both still use WIO-SX1262 shields, this proposal just uses the v1.0 version without the B2B connector. I think the naming would be more clear if the new board is named Xiao_S3_WIO_v1.