REQUEST: Add support for the LAN865x single-pair ethernet chip over SPI for ESP32

[DuaneKaufman]

Dear All,

Espressif recently added support for the LAN865x series of chips, which enables single-pair ethernet using an SPI interface rather than RMII.
Using SPI rather than RMII reduces the number of used GPIOs, and in situations which can tolerate slightly slower data transfer rates, the trade-off of fewer wires and more open GPIOs may be beneficial.

https://components.espressif.com/components/espressif/lan865x/versions/0.1.2/readme

I am willing to help sponsor this addition, as I have in mind a distributed control system I am designing.

Sincerely,
Duane Kaufman