feature #32504 [ErrorRenderer] Add DebugCommand for easy debugging and testing (yceruto)

This PR was squashed before being merged into the 4.4 branch (closes #32504).

Discussion
----------

[ErrorRenderer] Add DebugCommand for easy debugging and testing

| Q             | A
| ------------- | ---
| Branch?       | 4.4
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | -
| License       | MIT
| Doc PR        | -

![debug-error-renderer](https://user-images.githubusercontent.com/2028198/61086533-170a8a00-a401-11e9-89a6-3b8195ba80c1.gif)

This command helps you test built-in renderers and others provided by third-party packages (thinking API-Platform, FOSRestBundle, etc.) without requiring the TwigBundle preview mechanism.

<del>This also fixes a bug in `ErrorRendererPass` related to the order of priorities.</del>

Commits
-------

97c89686b1 [ErrorRenderer] Add DebugCommand for easy debugging and testing

Author: Tobion

Resources/config/console.xml

@@ -194,5 +194,11 @@
             <argument type="service" id="debug.file_link_formatter" on-invalid="null" />
             <tag name="console.command" command="debug:form" />
         </service>
+
+        <service id="console.command.error_renderer_debug" class="Symfony\Component\ErrorRenderer\Command\DebugCommand">
+            <argument type="collection" /> <!-- All error renderers are injected here by ErrorRendererPass -->
+            <argument type="service" id="debug.file_link_formatter" on-invalid="null" />
+            <tag name="console.command" command="debug:error-renderer" />
+        </service>
     </services>
 </container>