feature #32471 Add a new ErrorHandler component (mirror of the Debug component) (yceruto)

This PR was squashed before being merged into the 4.4 branch (closes #32471).

Discussion
----------

Add a new ErrorHandler component (mirror of the Debug component)

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

On top of symfony/symfony#32470

Commits
-------

b1b6e80a3d Add a new ErrorHandler component (mirror of the Debug component)

Author: fabpot

composer.json

@@ -38,8 +38,7 @@
     },
     "conflict": {
         "symfony/event-dispatcher": "<4.3",
-        "symfony/http-kernel": "<4.4",
-        "symfony/debug": "<4.4"
+        "symfony/http-kernel": "<4.4"
     },
     "suggest": {
         "enqueue/messenger-adapter": "For using the php-enqueue library as a transport."