[ComposerScriptHandler] Adding Symfony Process Component as dependency
[ComposerScriptHandler] Defining the console path in composer extras
[ComposerScriptHandler] Creating the script handler
[ComposerScriptHandler] Replacing the call from EventListener to ScriptHandler
[ComposerScriptHandler] Removing EventListener
[ComposerScriptHandler] Fixing CS
[ComposerScriptHandler] Improving PHPdoc