Support ethernet emac for ESP32

[Th3Link]

I'm looking to use the EMAC peripheral on the ESP32 for Ethernet connectivity. From what I understand, only the "original" ESP32 models include an EMAC.

Currently, I have devices using either LAN8720 or KSZ8081 PHY chips with C++ software built on ESP-IDF. As I'm gradually migrating my home automation setup to Rust, I'd like to rewrite this Ethernet driver functionality as well.

I'm wondering if anyone has already started working on Rust support for the ESP32 EMAC peripheral. If not, I'm planning to dive into this implementation.

I initially considered redesigning around a Wiznet W5500 chip instead, but it appears more expensive, and I specifically need IPv6 support since my home network is IPv6-only.

[MabezDev]

We have a tracking issue here: #4163 but no plans to work on this ourselves yet. Contributions most welcome!