Feature: #69730 - Introduce uniqueId generator
See forge#69730
Description
A new method get has been added to the StringUtility class.
Now there is a common way to generate an unique identifier which can be
used even in HTML tag attributes as it removes the invalid dot character.
$uniqueId = \TYPO3\CMS\Core\Utility\StringUtility::getUniqueId('Prefix');
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Impact
No need to remove the dot manually anymore.