Feature: #95065 - New PSR-14 BootCompletedEvent

See forge#95065


A new PSR-14 event \TYPO3\CMS\Core\Core\Event\BootCompletedEvent has been added to TYPO3 Core. This event is fired on every request when TYPO3 has been fully booted, right after all configuration files have been added.

This new Event complements the \TYPO3\CMS\Core\Configuration\Event\AfterTcaCompilationEvent which is executed after TCA configuration has been assembled.

Registration of the Event in your extensions' Services.yaml:

    - name: event.listener
      identifier: 'my-package/my-listener'
class MyEventListener {
    public function __invoke(BootCompletedEvent $e): void
        // do your magic


Use cases for this event is to alter or to boot up extensions' code which needs to be executed at any time, and needs TYPO3's full configuration including all loaded extensions.