Updated library inclusion for ESp32Servo

[bnshiva]

This PR is to add support for ESP32 Arch Type: ESP and ARDUINO_ARCH_ESP32. To perform this, we need to include Library from https://github.com/jkb-git/ESP32Servo. This change assumes the ESP32Servo is already downloaded into the Arduino libraries folder

In file included from <path>/Arduino/libraries/RC_ESC/src/ESC.h:16:0,
                 from <path>/Arduino/mysketch/mysketch.ino:5:
<some random path>/T/AppTranslocation//d/Arduino.app/Contents/Java/libraries/Servo/src/Servo.h:77:2: error: #error "This library only supports boards with an AVR, SAM, SAMD, NRF52 or STM32F4 processor."
 #error "This library only supports boards with an AVR, SAM, SAMD, NRF52 or STM32F4 processor."
  ^
exit status 1
Error compiling for board ESP32 Dev Module.

[bnshiva]

@photodude @RB-ENantel @per1234
Can you folks please review once you get a chance. :-) Open to changing this if you feel it needs to be done in a different way

[RB-ENantel]

@bnshiva / Thanks for this contribution.

• Have you been able to test this with real hardware ?
• How would it be "defined" in an example ?