Add local build environment for arduino-esp32 bsp 3.0.3 and PIO

[brentru]

@tyeth I'm changing the esp32-specific build step to utilize the community platformio support. This'll help us build locally off the latest BSP (currently 3.0.3).

I'd do the first two steps on this thread (espressif/arduino-esp32#10039 (comment)) to ensure you're deleting your cache and building using the correct files.

Also, if you are using a computer that pioarduino is missing from the Registry (https://github.com/pioarduino/registry), please follow the steps above to checkout a PR so we can help their community-led effort. My computer's architecture is already listed.

Related Discussion - espressif/arduino-esp32#10039

[brentru]

Tested that I could build, upload, and connect on Adafruit ESP32 v2 Feather

[tyeth]

This builds for me fine, locally on windows (clearing my packages and some espressif folders in platforms too as I had loads)

[Jason2866]

@brentru Nothing left which needs help to have all tools and toolchains for the next release of pioarduino which will be complete independent from Platformio registry.
Whats needed is coding and bug fix help ;-)