support for LAN8670 10Base-T1S

**Describe the problem you have/What new integration you would like**
I live in a very crowded environment - the 2.4GHz network is very unreliable (over 100 wifi networks). 5G is working fine but there is no support in ESPHome for such base boards. Of course I can go for classical Ethernet with ESP32, but there is relatively simple option of using new Ethernet standard - 10Base-T1S. Practical implementation would need a configuration for LAN8670 as a PHY, it can be a direct replacement of CAN network running on same cabling

**Please describe your use case for this integration and alternatives you've tried:**
I tried 2.4G Wifi and ESP32 Ethernet with PoE (from Olimex). It works but require a lot of cabling. Simple multi-drop Modbus-like network could be beneficial here. One can also use these two wires to transfer power (passive PoE)

**Additional context**
We are currently testing this solution in the lab https://github.com/sinara-hw/DiPho/issues/18