DigitalIO Class for ESP32SPI

[brentru]

This pull request adds mock DigitalIO and Pin pin support for the set_pin_mode and set_digital_write methods within adafruit_esp32spi.py (via PR #38).
https://circuitpython.readthedocs.io/en/4.x/shared-bindings/digitalio/__init__.html#module-digitalio

Usage Example

import adafruit_esp32spi.digitalio

led = adafruit_esp32spi.digitalio.DigitalInOut(esp, 25)

led.direction = adafruit_esp32spi.digitalio.Direction.OUTPUT

while True:
    led.value = True
    time.sleep(0.5)
    led.value = False
    time.sleep(0.5)

Test Hardware: Feather M4 + AirLift FeatherWing (Green LED connected to ESP GPIO 25)