feat(usb_hid_keyboard): Adds Keyboard Layout and Sends reports just for Modifier Keys

[SuGlider]

Description of Change

This PR fixes a problem related to sending just modifier key pressing/releasing (SHIFT/CTRL/ALT). It also adds the upstream Keyboard Layouts to the library. Additionally it adds the Brazilian ABNT2 Keyboard Layout.

Tests scenarios

Tested with ESP32-S3 using a Keyboard Test website. Configuration: CDC on Boot: Disabled || USB Mode: OTG(TinyUSB)

#include "USB.h"
#include "USBHIDKeyboard.h"
USBHIDKeyboard Keyboard;
const int buttonPin = 0;  // input pin for pushbutton

void setup() {
  // make pin 0 an input and turn on the pull-up resistor so it goes high unless
  // connected to ground:
  pinMode(buttonPin, INPUT_PULLUP);
  Serial.begin(115200);
  while (!Serial) delay(100);

  Serial.println();
  Serial.println("Starting USB Keyboard Device.");
  Serial.println();

  Keyboard.begin();
  USB.begin();
}

void pressRelease(uint8_t k) {
  Keyboard.press(k);
  delay(1000);
  Keyboard.release(k);
  delay(1000);
}

void loop() {
  while (digitalRead(buttonPin) == HIGH) {
    // do nothing until button pin goes low
    delay(50);
  }
  delay(500);

  // test all 8 modifier keys - press & release
  pressRelease(KEY_RIGHT_SHIFT);
  pressRelease(KEY_LEFT_SHIFT);
  pressRelease(KEY_RIGHT_CTRL);
  pressRelease(KEY_LEFT_CTRL);
  pressRelease(KEY_RIGHT_ALT);
  pressRelease(KEY_LEFT_ALT);
  pressRelease(KEY_RIGHT_GUI);
  pressRelease(KEY_LEFT_GUI);

  Serial.println("Done.");
}

The new Keyboard Layout needs a compatible Keyboard of the selected location. Example:

#include "USB.h"
#include "USBHIDKeyboard.h"
#include "keyboardLayout/Keyboard_pt_BR.h" // using Portuguese - ABNT2 Keyboard Layout

USBHIDKeyboard Keyboard;
const int buttonPin = 0;  // input pin for pushbutton

void setup() {
  // make pin 0 an input and turn on the pull-up resistor so it goes high unless
  // connected to ground:
  pinMode(buttonPin, INPUT_PULLUP);
  Serial.begin(115200);

  Keyboard.begin(KeyboardLayout_pt_BR);
  USB.begin();
}

void loop() {
  while (digitalRead(buttonPin) == HIGH) {
    // do nothing until pin 2 goes low
    delay(50);
  }

  // presses all ASCII table respective keys 
  for (char i = 32;  i < 128; i++) {
    Keyboard.write(i);
    if (i == '`' || i == '~') {
      Keyboard.write(' ');  // otherwise it may affect the next character
      delay(50);
    }
    delay(50); // minimum time between keystrokes for Windows OS
  }
  // sends enter
  Keyboard.println();
}

Related links

Fixes #10368

[github-actions[bot]]

	Warnings
:warning:	Please consider squashing your 6 commits (simplifying branch history).

	Messages
:book:	This PR seems to be quite large (total lines of code: 1983), you might consider splitting it into smaller PRs

👋 Hello SuGlider, we appreciate your contribution to this project!

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Test Results

 56 files   56 suites   4m 15s ⏱️  21 tests  21 ✅ 0 💤 0 ❌ 134 runs  134 ✅ 0 💤 0 ❌

Results for commit b5b5ebd3.

:recycle: This comment has been updated with latest results.