Add a PHP routing file and deprecate the XML file #499
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Fixes #498
Symfony 7.4 deprecates the XML format for routing and 8.0 removes it. This creates a new PHP routing file to address the deprecation and provides a B/C layer similar to that used in the core WebProfilerBundle by having the XML file import the PHP file and uses the same trick the framework settled for to emit a deprecation notice for downstream users.