boards: adafruit: add initial support for esp32s3 feather

The Adafruit Feather ESP32S3 is a development board in the Feather
standard layout, sharing peripheral placement with other devices labeled
as Feathers or FeatherWings. The board is equipped with an ESP32-S3 mini
module, a lithium ion battery charger and a USB-C connector.

Signed-off-by: Leon Rinkel <leon@rinkel.me>