Add symfony/messenger recipe

symfony/amqp-pack/1.0/manifest.json

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+{
+    "aliases": ["amqp"]
+}

symfony/messenger/4.1/config/packages/messenger.yaml

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+framework:
+    messenger:
+        transports:
+            # Uncomment the following line to enable a transport named "amqp"
+            # amqp: '%env(MESSENGER_ADAPTER_DSN)%'
+
+        routing:
+            # Route your messages to the transports
+            # 'App\Message\YourMessage': amqp

symfony/messenger/4.1/manifest.json

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+{
+    "copy-from-recipe": {
+        "config/": "%CONFIG_DIR%/"
+    },
+    "env": {
+        "#1": "MESSENGER_ADAPTER_DSN=amqp://guest:guest@localhost:5672/%2f/messages"
+    },
+    "aliases": ["messenger"]
+}

symfony/messenger/4.1/post-install.txt

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+<bg=blue;fg=white>              </>
+<bg=blue;fg=white> What's next? </>
+<bg=blue;fg=white>              </>
+
+  * You're ready to use the Messenger component. You can define your own message buses
+    or start using the default one right now by injecting the <info>messenger.bus.default</info> service
+    or typehinting <info>Symfony\Component\Messenger\MessageBusInterface</info> in your code.
+
+  * If you need to send messages to your broker, you can benefit from the built-in
+    AMQP transport by:
+
+    1. Installing the AMQP pack by running <info>composer require amqp</>;
+    2. Uncommenting the <comment>MESSENGER_ADAPTER_DSN</> env var
+       and <comment>framework.messanger.transports.amqp</> config;
+    3. Routing your messages to the amqp sender.
+
+  * <fg=blue>Read</> the documentation at <comment>https://symfony.com/doc/master/messenger.html</>