feat(checkbox): Add keyboard handling for Enter and Space keys to tog…

[mryunt02]

Summary of Changes

• Added keyboard functionality to the input component to toggle the checked state when the Enter or Space key is pressed.

Changes Made

1. Implemented the handleKeyDown function:

private handleKeyDown(event: KeyboardEvent) {
    if (event.code === "Enter" || event.code === "Space") {
        this.checked = !this.checked;
        this.onChange(this.checked);
        event.preventDefault();
    }
}

2. Associated the function with the @keydown event listener:
   <input @keydown=${this.handleKeyDown} />

Reason for Changes

This change was made to enhance user interaction with form elements via the keyboard and to improve accessibility.

[github-actions]

🎉 This PR is included in version 3.3.0-beta.5 🎉

The release is available on:

• npm package (@beta dist-tag)
• GitHub release

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