feature #32912 [Mailer] Add support for the profiler (fabpot)

This PR was merged into the 4.4 branch.

Discussion
----------

[Mailer] Add support for the profiler

| Q             | A
| ------------- | ---
| Branch?       | 4.4
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | no     <!-- see https://symfony.com/bc -->
| Deprecations? | no <!-- please update UPGRADE-*.md and src/**/CHANGELOG.md files -->
| Tests pass?   | yes    <!-- please add some, will be required by reviewers -->
| Fixed tickets | closes #31592
| License       | MIT
| Doc PR        | n/a

Web profiler for the Mailer.

Commits
-------

f152314e28 [Mailer] added support for the profiler

Author: fabpot

Resources/config/mailer_debug.xml

@@ -8,5 +8,10 @@
         <service id="mailer.logger_message_listener" class="Symfony\Component\Mailer\EventListener\MessageLoggerListener">
             <tag name="kernel.event_subscriber"/>
         </service>
+
+       <service id="mailer.data_collector" class="Symfony\Component\Mailer\DataCollector\MessageDataCollector">
+            <argument type="service" id="mailer.logger_message_listener" />
+            <tag name="data_collector" template="@WebProfiler/Collector/mailer.html.twig" id="mailer" />
+        </service>
     </services>
 </container>