Add PlatformIO support to enable VSCode and CI support

[ZzEeKkAa]

• Add PlatformIO support to enable development from VSCode
• Add CI check (build for esp32 and esp32s3 inherited from PlatformIO)
• Comment out Serial.setTxTimeoutMs(2); because there is no such method available with latest framework

I also have few improvement PRs ready:

• https://github.com/ZzEeKkAa/ESP32RET/pull/2 - auto update for the new Arduino libraries available;
• https://github.com/ZzEeKkAa/ESP32RET/pull/3 - auto formatter based on llvm's clang-format tool to keep code consistent.

Please let me know if it is something you are interested and then I can open those PRs as well.

[dreanmer]

I was trying to do this last week, but when i compile it in my esp32 (not s3) its keep rebooting with spinlock error:

[italocjs]

I was trying to do this last week, but when i compile it in my esp32 (not s3) its keep rebooting with spinlock error:

I had this same issue (not using this branch), in the end I had to manually override the board type, it was trying to compile to machina A0 not esp32. here is my fork for pio and esp32. https://github.com/italocjs/ESP32_GVRET-Pertubs