feat: allow gps init with address

Adafruit's Mini GPS PA1010D Module works with this device driver, but requires 0x10 as the address, rather than 0x42.

This change allows the device to be initialised with whatever i2c address is needed, while maintaining backward compatibility.

Adds new constants to allow easy configuration of both the ublox device and the PA1010D.

examples/gps/i2c/main.go

@@ -10,7 +10,7 @@ import (
 func main() {
 	println("GPS I2C Example")
 	machine.I2C0.Configure(machine.I2CConfig{})
-	ublox := gps.NewI2C(machine.I2C0)
+	ublox := gps.NewI2CWithAddress(machine.I2C0, gps.UBLOX_I2C_ADDRESS)
 	parser := gps.NewParser()
 	var fix gps.Fix
 	for {