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Documentation for DAC peripheral (#6337)

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###
DAC
###
About
-----
DAC (digital to analog converter) is a very common peripheral used to convert a digital signal to an
analog form.
ESP32 and ESP32-S2 have two 8-bit DAC channels. The DAC driver allows these channels to be set to arbitrary voltages.
DACs can be used for generating a specific (and dynamic) reference voltage for external sensors,
controlling transistors, etc.
========= ========= =========
ESP32 SoC DAC_1 pin DAC_2 pin
========= ========= =========
ESP32 GPIO 25 GPIO 26
ESP32-S2 GPIO 17 GPIO 18
========= ========= =========
Arduino-ESP32 DAC API
---------------------
dacWrite
********
This function is used to set the DAC value for a given pin/DAC channel.
.. code-block:: arduino
void dacWrite(uint8_t pin, uint8_t value);
* ``pin`` GPIO pin.
* ``value`` to be set. Range is 0 - 255 (equals 0V - 3.3V).
dacDisable
**********
This function is used to disable DAC output on a given pin/DAC channel.
.. code-block:: arduino
void dacDisable(uint8_t pin);
* ``pin`` GPIO pin.