[ Feature request ] Add function to swap I2S clocks

[nils-trubkin]

The library cannot i2s.swapClocks() for the I2S output devices.
Two clocks being swapped are BCLK and WCLK (aka. WS, aka. LRCLK).

This is useful when pins on the hardware come in the opposite order from that of the board and saves the need to cross-wire.
Details of this are described in the arduino-pico lib: Link to issue 1287