Adds support to change LoopTask Stack size

[SuGlider]

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:

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

#6010 (comment)
Thanks @igrr for the suggestion!

[me-no-dev]

@SuGlider let's add one example that shows the usage :)

[igrr]

+1 regarding adding an example. I think you can call some FreeRTOS function like uxTaskGetStackHighWaterMark(NULL) from setup() to demonstrate that the available stack space is increased when ESP_LOOP_TASK_STACK_SIZE is added. Once we have the test framework up and running, this would also make it easier for us to test that this functionality doesn't get broken — we can run this example in CI and check the a value larger than a certain threshold is printed.

[pedrominatel]

Add to the docs as well.

[pedrominatel]

Besides the macro, are we going to add this configuration through the Arduino IDE Tools menu with some predefined options?

[me-no-dev]

Besides the macro, are we going to add this configuration through the Arduino IDE Tools menu with some predefined options?

Not really. This is niche usage. For all the default should be plenty.

[SuGlider]

+1 regarding adding an example. I think you can call some FreeRTOS function like uxTaskGetStackHighWaterMark(NULL) from setup() to demonstrate that the available stack space is increased when ESP_LOOP_TASK_STACK_SIZE is added. Once we have the test framework up and running, this would also make it easier for us to test that this functionality doesn't get broken — we can run this example in CI and check the a value larger than a certain threshold is printed.

Done. Example commited.
@pedrominatel - in the example, I added some commentaries explaining it. Maybe it can be used for documentation.