feature #1027 [Platform] Add ID to message bag (lochmueller)

This PR was merged into the main branch.

Discussion
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[Platform] Add ID to message bag

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| Docs?         | no
| Issues        |
| License       | MIT

Add ID to the message bag.

Commits
-------

3bbb0da feat: Add ID to message bag

Author: OskarStark

src/platform/src/Message/MessageBag.php

@@ -12,6 +12,9 @@
 namespace Symfony\AI\Platform\Message;
 
 use Symfony\AI\Platform\Metadata\MetadataAwareTrait;
+use Symfony\Component\Uid\AbstractUid;
+use Symfony\Component\Uid\TimeBasedUidInterface;
+use Symfony\Component\Uid\Uuid;
 
 /**
  * @author Christopher Hertel <mail@christopher-hertel.de>
@@ -22,6 +25,8 @@ class MessageBag implements \Countable, \IteratorAggregate
 {
     use MetadataAwareTrait;
 
+    private AbstractUid&TimeBasedUidInterface $id;
+
     /**
      * @var list<MessageInterface>
      */
@@ -30,6 +35,12 @@ class MessageBag implements \Countable, \IteratorAggregate
     public function __construct(MessageInterface ...$messages)
     {
         $this->messages = array_values($messages);
+        $this->id = Uuid::v7();
+    }
+
+    public function getId(): AbstractUid&TimeBasedUidInterface
+    {
+        return $this->id;
     }
 
     public function add(MessageInterface $message): void