Feature: #76107 - Add fluid interceptor registration

See forge#76107

Description

Interceptors in Fluid Standalone have been introduced to be able to change the template output. The Fluid API already allows for registration of custom interceptors. Now it is possible to define custom interceptors via the following option:

$GLOBALS['TYPO3_CONF_VARS']['fluid']['interceptors']
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Interceptors registered here are added to the Fluid parser configuration.

Impact

Extensions are able to register custom interceptors using the available configuration in $TYPO3_CONF_VARS[fluid][interceptors].

Registered classes have to implement the \TYPO3Fluid\Fluid\Core\Parser\InterceptorInterface.

// Register an own interceptor to fluid parser configuration
$GLOBALS['TYPO3_CONF_VARS']['SYS']['fluid']['interceptors'][\TYPO3\CMS\Fluid\Core\Parser\Interceptor\DebugInterceptor::class] =
   \TYPO3\CMS\Fluid\Core\Parser\Interceptor\DebugInterceptor::class;
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use TYPO3Fluid\Fluid\Core\Parser\InterceptorInterface;
use TYPO3Fluid\Fluid\Core\Parser\ParsingState;
use TYPO3Fluid\Fluid\Core\Parser\SyntaxTree\NodeInterface;

class DebugInterceptor implements InterceptorInterface
{
   public function process(NodeInterface $node, $interceptorPosition, ParsingState $parsingState) : NodeInterface
   {
      return $node;
   }

   public function getInterceptionPoints()
   {
      return [];
   }
}
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