Adds default Wire1 pins auto-setup

[SuGlider]

Description of Change

Some boards define SDA1 and SCL1 pins for Wire1 peripheral.
This information isn't used in Wire1.begin() as pins default.
The PR adds this functionality and set default pins when they are correctly created in pins_arduino.h

These pins shall be set in variants/<board_name>/pins_arduino.h like this example:

#define WIRE1_PIN_DEFINED 1             // See Wire.cpp at bool TwoWire::initPins(int sdaPin, int sclPin)
static const uint8_t SDA1 = 2;
static const uint8_t SCL1 = 4;

Tests scenarios

Tested with ESP32/S2/S3.

Note ESP32-C3 has just 1 I2C peripheral

Related links

Closes #6999

[P-R-O-C-H-Y]

@SuGlider Would be good to add to our official boards SDA1 and SCL1 defines too. (eg. esp32, esp32s2 and esp32s3 variants).

[ladyada]

Tested a QT Py ESP32 (where the QT connector is Wire1) and it worked great :)