Added dispatcher::beforeForward event

[sergeyklay]

Hello!

• Type: new feature
• Link to issue: Dispatch to another module in a multi-module app #121, Create dispatcher::beforeForward event #12417, [NFR][1.3.0] Multimodule dispatching problem #1658, Better HMVC module support in Phalcon #2496

In raising this pull request, I confirm the following:

• I have read and understood the Contributing Guidelines?
• I have checked that another pull request for this purpose does not exist.
• I wrote some tests for this PR.

Small description of change: Added dispatcher::beforeForward event to allow forwarding request to the separated module.

use Phalcon\Events\Event;
use Phalcon\Mvc\Dispatcher;
use App\Backend\Bootstrap as Backend;
use App\Frontend\Bootstrap as Frontend;

// Registering modules
$modules = [
    'frontend' => [
        'className' => Frontend::class,
        'path'      => __DIR__ . '/app/Modules/Frontend/Bootstrap.php',
        'metadata'  => [
            'controllersNamespace' => 'App\Frontend\Controllers',
        ],
    ],
    'backend' => [
        'className' => Backend::class,
        'path'      => __DIR__ . '/app/Modules/Backend/Bootstrap.php',
        'metadata'  => [
            'controllersNamespace' => 'App\Backend\Controllers',
        ],
    ],
];

$application->registerModules($modules);

// Setting beforeForward listener
$eventsManager = $di->getShared('eventsManager');

$eventsManager->attach(
    'dispatch:beforeForward',
    function(Event $event, Dispatcher $dispatcher, array $forward) use ($modules) {
        $metadata = $modules[$forward['module']]['metadata'];

        $dispatcher->setModuleName($forward['module']);
        $dispatcher->setNamespaceName($metadata['controllersNamespace']);
    }
);

// Forward
$this->dispatcher->forward(
    [
        'module'     => 'backend',
        'controller' => 'posts',
        'action'     => 'index',
    ]
);

Thanks