Add support for KnpMenu 3 (#46)

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Closes #45 

## Subject

Allow KnpMenu 2 / 3.

composer.json

@@ -21,7 +21,7 @@
     ],
     "require": {
         "php": "^7.3",
-        "knplabs/knp-menu": "^2.1",
+        "knplabs/knp-menu": "^2.1 || ^3.1",
         "sonata-project/block-bundle": "^4.0",
         "symfony/config": "^4.2 || ^5.0",
         "symfony/dependency-injection": "^4.2 || ^5.0",

phpstan-baseline.neon

@@ -140,16 +140,6 @@ parameters:
 			count: 1
 			path: tests/BundleIntegrationTest.php
 
-		-
-			message: "#^Parameter \\#1 \\$factory of class Core23\\\\MenuBundle\\\\Menu\\\\ConfigBuilder constructor expects Knp\\\\Menu\\\\FactoryInterface, object given\\.$#"
-			count: 7
-			path: tests/Menu/ConfigBuilderTest.php
-
-		-
-			message: "#^Parameter \\#2 \\$translator of class Core23\\\\MenuBundle\\\\Menu\\\\ConfigBuilder constructor expects Symfony\\\\Contracts\\\\Translation\\\\TranslatorInterface, object given\\.$#"
-			count: 7
-			path: tests/Menu/ConfigBuilderTest.php
-
 		-
 			message: "#^Parameter \\#1 \\$builder of class Core23\\\\MenuBundle\\\\Provider\\\\ConfigProvider constructor expects Core23\\\\MenuBundle\\\\Menu\\\\ConfigBuilderInterface, object given\\.$#"
 			count: 4