Add service alias for the interface

Alias `Symfony\Cmf\Component\Routing\ChainRouterInterface` to `cmf_routing.router` to allow autowiring in strict mode

Author: JoppeDC

src/Resources/config/routing-chain.xml

@@ -11,5 +11,6 @@
                 <argument type="service" id="router.request_context" />
             </call>
         </service>
+        <service id="Symfony\Cmf\Component\Routing\ChainRouterInterface" alias='cmf_routing.router'/>
     </services>
 </container>