Adding stepper without DIR pin

[Voha888]

To save the number of free pins, I needed to implement this, but there is no support in the library.
I could do it if the authors of the project allow

[pkerspe]

Please feel free to submit a pull request, I will check and merge it if all is ok

[Voha888]

I created first pull request in my life, i think it"s ok))

#9

Description:
I took into account the contents of the file

core \ packages \ framework-arduinoespressif32 \ cores \ esp32 \ esp32-hal-gpio.c

We'll assign the default DIR pin number 255:
void connectToPins (byte stepPinNumber, byte directionPinNumber = 255);

For pinMode, a check is required because there is a code like this:
uint32_t rtc_reg = rtc_gpio_desc [pin] .reg;
where the rtc_gpio_desc array has only 40 cells, and our nonexistent pin is 255, so I added a check:

if (directionPin <255) {
pinMode (directionPin, OUTPUT);
}

We do not change the digitalWrite function in any way, because the value 255 will not be used in it:

extern void IRAM_ATTR __digitalWrite (uint8_t pin, uint8_t val)
{
    if (val) {
        if (pin <32) {
            GPIO.out_w1ts = ((uint32_t) 1 << pin);
        } else if (pin <34) {
            GPIO.out1_w1ts.val = ((uint32_t) 1 << (pin - 32));
        }
    } else {
        if (pin <32) {
            GPIO.out_w1tc = ((uint32_t) 1 << pin);
        } else if (pin <34) {
            GPIO.out1_w1tc.val = ((uint32_t) 1 << (pin - 32));
        }
    }