Add new board ESP32-S3-ETH

[danieljharris]

Add support for: https://www.waveshare.com/wiki/ESP32-S3-ETH

Fixes Issue: #1569

Recommended ESP32-S3-ETH config (from their site):

[valeros]

Hi @danieljharris, thanks for the PR. I see ESP32S3 Dev Module is used as the board on your screenshot , but in the manifest you set esp32s3eth in the variant field.

[amayhall-gloop]

Any update on this making it into the board explorer? No rush I was just curious as I've got a couple projects using these boards already and wanted to make the jump into PlatformIO.

[danieljharris]

ESP32S3 Dev Module

From other examples such as esp32s3camlcd it looks like this approach to variant names is common. Please correct me if I am wrong and there is a better name for this. esp32s3eth better describes the variant than just dev module as there are specific configs for this variant of board recommended by the manufacturer.

[alexmiller422]

When using this board file with the aruino framework, I get fatal error: pins_arduino.h: No such file or directory

I believe this file needs to exist under the directory .platformio/packages/framework-arduinoespressif32/variants/<variant name>

Setting the vairnat to esp32s3 works.