esp32s2/i2s: use internal buffer to handle multiple audio formats

[tmedicci]

Summary

Very similar to #7501:

1. Creates an internal buffer handled by the ESP32-S2's I2S driver to be able to make the necessary manipulations to correctly fit the characteristics of the I2S's FIFO (byte alignment according to the data width).
2. Stops and restarts I2S peripheral every time master clock and sample rate are changed.
3. Other small fixes (like using nxmutex instead nxsem and formatting).

Impact

Supporting multiple sample rates, data widths and mono/stereo sources.

Testing

Hardware testing with ESP32-S2-Saola-1 + CS4344 and internal CI