Add MultiTouchBlink examples

[aliphys]

This PR adds two examples, that blinks the LED on the GIGA R1 WiFi based on the number of touches registered on the screen.

• ⁉️ MultiTouchBlink_IRQ.ino shows how to attach and detach an interrupt (be calling touchDetector.begin();
• 🚥 The LED onboard the GIGA R1 WiFi is used to display the feedback from the touch events. Using the RGB LED on the GIGA Display Shield itself would create a cyclical dependency since the GIGADisplayRGB class is part of arduino-libraries/Arduino_GigaDisplay
• 🌐 Both interrupt MultiTouchBlink_IRQ.ino and polling approaches MultiTouchBlink_Polling.ino are covered.

✨ Thanks for initial testing and feedback by @Hannes7eicher and @pedromsousalima
Closes #10

[leonardocavagnis]

Instead of calling begin/end, it might make more sense to use the detach function.

[leonardocavagnis]

Suggested change

	touchDetector.end(); // close the touch controller
	touchDetector.detach();

[aliphys]

I did not see a member function for .detach() in the Arduino_GigaDisplayTouch.h header. When making the change recommended the following error is given.

C:\GitHub\Arduino\Arduino_GigaDisplayTouch\examples\MultiTouchBlink_IRQ\MultiTouchBlink_IRQ.ino:30:17: error: 'class Arduino_GigaDisplayTouch' has no member named 'detach'
   touchDetector.detach();  // close the touch controller
                 ^~~~~~

Using library Arduino_GigaDisplayTouch at version 1.0.1 in folder: C:\Users\Ali Jahangiri\Documents\Arduino\libraries\Arduino_GigaDisplayTouch 
Using library Wire in folder: C:\Users\Ali Jahangiri\AppData\Local\Arduino15\packages\arduino\hardware\mbed_giga\4.1.3\libraries\Wire (legacy)
exit status 1

Compilation error: 'class Arduino_GigaDisplayTouch' has no member named 'detach'

I agree, having a detach() method would be greatly appreciated 😄 ! See #8

[leonardocavagnis]

Suggested change

touchDetector.begin();

[aliphys]

I agree it is not a pretty solution, but it works. One should not use begin() in the middle of a sketch to restart the GT911 module. See: #11 (comment)

[aliphys]

The MultiTouchBlink_Polling.ino example has an issue where sends the same message to the Serial twice, for a single touch event. It seems as if the values provided by touchDetector.getTouchPoints(points); are not flushed even with a one second delay.

Arduino_GigaDisplayTouch/examples/MultiTouchBlink_Polling/MultiTouchBlink_Polling.ino

Line 47 in e1a53e2

contactPoints = touchDetector.getTouchPoints(points);

MultiTouchBlink_IRQ.ino

✅ Each touch event, is represented by a single message in the Serial Monitor (as well as a single Blink of the GIGA R1 WiFi LED)

VID_20240613_113431.mp4

MultiTouchBlink_Polling.ino

❌ Each touch event, is represented by a two messages in the Serial Monitor, separated by the delay value (as well as a duplicate Blink of the GIGA R1 WiFi LED)

VID_20240613_114511.mp4