[HttpKernel][EventDispatcher] Wrap some log contexts with ClassStub #19829
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This PR will be useful when #19614 will be merged to get more detailed log contexts in the "Logs" profiler panel.
This screenshot has been taken with both branches checked out at the same time:

Since
ClassStub
implements__toString
, contexts are logged as e.g.request.INFO: Matched route "{route}". {"route":"app_lucky_number","route_parameters":{"_controller": "[object] (Symfony\\Component\\VarDumper\\Caster\\ClassStub: AppBundle\\Controller\\LuckyController::numberAction)","_route": "app_lucky_number"},"request_uri":"http://127.0.0.1:8000/lucky/number","method":"GET"} []
by Monolog's NormalizerFormatter.Seldaek/monolog#843 or some variant of it should fix this back to a plain string.