Adds support to change LoopTask Stack size (#6025)

## Summary
Arduino ```setup()``` and ```loop()``` run under a Task with a fixed Stack size of 8KB.
Users may want to change this size.

This PR adds this possibility by just adding a line of code, as for example:
``` dart
ESP_LOOP_TASK_STACK_SIZE(16384);

void setup() { 
}

void loop() { 
}
```
## Impact
None. It adds a new functionality to ESP32 Arduino.
If ```ESP_LOOP_TASK_STACK_SIZE(newSize);``` is not declared/used, it will compile the sketch with the default stack size of 8KB.

## Related links
fix #6010 

https://github.com/espressif/arduino-esp32/issues/6010#issuecomment-992701658
Thanks @igrr for the suggestion!

libraries/ESP32/examples/ArduinoStackSize/ArduinoStackSize.ino

@@ -0,0 +1,36 @@
+/*
+    ESP32 Arduino creates a task to run setup() and then to execute loop() continuously
+    This task can be found at https://github.com/espressif/arduino-esp32/blob/master/cores/esp32/main.cpp
+
+    By default "loopTask" will be created with a stack size of 8KB.
+    This should be plenty for most general sketches.
+
+    There is a way to change the stack size of this task by using
+    SET_LOOP_TASK_STACK_SIZE(size);
+    It will bypass the default stack size of 8KB and allow the user to define a new size.
+
+    It is recommend this value to be higher than 8KB, for instance 16KB.
+    This increasing may be necessary for the sketches that use deep recursion for instance.
+
+    In this example, you can verify it by changing or just commenting out SET_LOOP_TASK_STACK_SIZE();
+*/
+
+
+// This sets Arduino Stack Size - comment this line to use default 8K stack size
+SET_LOOP_TASK_STACK_SIZE(16*1024); // 16KB
+
+void setup() {
+  Serial.begin(115200);
+
+  Serial.printf("Arduino Stack was set to %d bytes", getArduinoLoopTaskStackSize());
+
+  // Print unused stack for the task that is running setup()
+  Serial.printf("\nSetup() - Free Stack Space: %d", uxTaskGetStackHighWaterMark(NULL));
+}
+
+void loop() {
+  delay(1000);
+
+  // Print unused stack for the task that is running loop() - the same as for setup()
+  Serial.printf("\nLoop() - Free Stack Space: %d", uxTaskGetStackHighWaterMark(NULL));
+}