[ESP32] TX and RX pin set function

[BrushlessPower]

Sbus.Begin(RX_PIN, TX_PIN);

Sbus.SetPins(RX_PIN, TX_PIN);

something like this

[ericlangel]

also add the selection of Serial0, Serial1, or Serial2

Sbus2.Begin(RX_PIN, TX_PIN, UART_NUM);