Feature: #56633 - Form protection API for frontend usage

Description

As of now frontend plugins needed to implement CSRF protection on their own. This change introduces a new class to allow usage of the FormProtection (CSRF protection) API in the frontend.

Usage is the same as in backend context:

$formToken = \TYPO3\CMS\Core\FormProtection\FormProtectionFactory::get()
	->getFormProtection()->generateToken('news', 'edit', $uid);


if ($dataHasBeenSubmitted
	&& \TYPO3\CMS\Core\FormProtection\FormProtectionFactory::get()->validateToken(
		\TYPO3\CMS\Core\Utility\GeneralUtility::_POST('formToken'),
		'news',
		'edit',
		$uid
	)
) {
	// Processes the data.
} else {
	// Create a flash message for the invalid token or just discard this request.
}

Impact

FormProtection API can now also be used in frontend context.