Apds9960 gesture sensing functionality

[batkay]

Description

This PR updates the APDS9960 gesture sensor with the ability to process gestures from it's gesture engine.

Specific Changes

• Added KConfig option to enable gestures and set a detection threshold.
• Added private enum for gesture channel and its results.
• Added logic to read the gesture diode FIFO, and interpret results into UP, DOWN, LEFT, and RIGHT gestures.
• Updated sample program to display gestures (starts disabled to not disrupt previous behavior).

Testing

Testing was done with a nRF52840dk, with the following device overlay:

&i2c0 {

	apds9960: avago_apds9960@39 {
		compatible = "avago,apds9960";
		// int-gpios = <&gpio1 2 GPIO_ACTIVE_HIGH>;
		reg = <0x39>;
	};
};

In addition, in the prj.conf file, the following line was modified:
'CONFIG_APDS9960_ENABLE_GESTURE=y'

The new sample program output shows the following output with gestures:

[sonarqubecloud]

Quality Gate passed

Issues
4 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud