Adds pseudo random numbers generation

[SuGlider]

Description of Change

Currently radom() uses a real hardware generator.
Arduino mainstream random() uses a software pseudo generator that always returns the same pseudo random sequence based on a seed defined with randomSeed()

This PR implements a similar behavior as the ESP8266 Arduino:

1. By default, random() will use the ESP32 Hardware real random generator
2. If the Sketch calls randomSeed(), the Arduino Core will understand that it wants to follow Arduino behavior and it will generate a Pseudo Random number based on that seed.
3. Adds a new function void useRealRandomGenerator(bool useRandomHW) that, at any time, tells Arduino if random() shall use Hardware or Software random generator.

Tests scenarios

Tested on ESP32

testing sketch:

void printRandomSequence(int val1, int val2) {
//  Serial.printf("random(%d, %d) ::\n", val1, val2);
  Serial.print(random(val1, val2));
  for (uint8_t i = 0; i < 9; i++) {
    Serial.printf(" | %d", random(val1, val2));
  }
  Serial.println();
  
}

void setup() {
  Serial.begin(115200);
  delay(1000); // time for opening the Serial Monitor
  
  Serial.println("\n======\nRandom Testing with random(1, 5)\n======");
  
  Serial.println("\nDefault Hardware Random sequence generation 2x (different seq.)");
  printRandomSequence(1, 5);
  printRandomSequence(1, 5);
  
  Serial.println("\nPseudo Random sequence generation - Seed(100) 2x (same seq.)");
  randomSeed(100); 
  printRandomSequence(1, 5);
  randomSeed(100); 
  printRandomSequence(1, 5);
  
  Serial.println("\nuseRealRandomGenerator(true):: random sequence generation 2x (different seq.)");
  useRealRandomGenerator(true); 
  printRandomSequence(1, 5);
  printRandomSequence(1, 5);

  Serial.println("\nuseRealRandomGenerator(false):: random sequence generation 2x (same seq. - after reboot)");
  useRealRandomGenerator(false); 
  printRandomSequence(1, 5);
  printRandomSequence(1, 5);

  delay(5000);
  Serial.println("\n---Compare the sequences through rebooting...\n");
  esp_restart();
}

void loop() {
// nothing here.  
}

Related links

Fix #7404