[Build] Add ESP32 IRExt with Ethernet build environments

[tonhuisman]

From a Forum request

Features:

• Add IRExt with Ethernet builds:
  • custom_IR_ESP32_4M316k_ETH
  • custom_IR_ESP32_16M8M_LittleFS_ETH
  • normal_ESP32_IRExt_4M316k_ETH
• Prepared also some more IRExt/ETH builds, but not activated yet (to limit PR build-times):
  • collection_A_ESP32_IRExt_4M316k_ETH .. collection_F_ESP32_IRExt_4M316k_ETH, energy_ESP32_IRExt_4M316k_ETH, display_ESP32_IRExt_4M316k_ETH, climate_ESP32_IRExt_4M316k_ETH and neopixel_ESP32_IRExt_4M316k_ETH
• Mark used GPIO pin as unusable if Preferred network medium is Ethernet, and Ethernet Clock is configured using that GPIO

[ironataerial]

ESP_Easy_mega_20221227_normal_ESP32_IRExt_4M316k_ETH IR - Tx and Rx show up ok on Device / Pulldown
But
ESP_Easy_custom_20221227_custom_ESP32_IRExt_4M316k_ETH seesm to be missing the IR (?)

-D

[TD-er]

Then you can add the P016 and P035 plugins to the https://github.com/letscontrolit/ESPEasy/blob/mega/tools/pio/pre_custom_esp32.py

The reason there is a custom_IR env is because otherwise the IR libraries are in the lib_ignore list.
Right now we only have a single pre_custom_esp32.py file and if we add those IR plugins to it, it will fail builds for the non-IR custom builds.