ESP32 PCNT: add support for all counting units

[Hallootto1100]

The current driver for the PCNT (pulse counting) can only capture the first counting unit.
Furthermore, the driver uses the sensor api and implements the SENSOR_CHAN_ROTATION without actually converting the unit to degrees.

zephyr/drivers/sensor/espressif/pcnt_esp32/pcnt_esp32.c

Line 111 in a2ebe49

val->val1 = config->unit_config[0].count_val_acc + config->unit_config[0].offset;

Before I start implementing my own driver or start to improve the one above, am I missing something?
The devicetree binding seem to have multiple counter units in mind.

&pcnt {
      pinctrl-0 = <&pcnt_default>;
      pinctrl-names = "default";
      status = "okay";
      #address-cells = <1>;
      #size-cells = <0>;
      unit0@0 {
        reg = <0>;
        #address-cells = <1>;
        #size-cells = <0>;
        filter = <100>;
        channelA@0 {
            reg = <0>;
            sig-pos-mode = <2>;
            sig-neg-mode = <1>;
            ctrl-h-mode = <0>;
            ctrl-l-mode = <1>;
        };
      };
    };

https://github.com/zephyrproject-rtos/zephyr/blob/2c1da15e3565af76f60fd87407c33d59231f7c0c/dts/bindings/sensor/espressif,esp32-pcnt.yaml