valide request against openapi schema

Author: JMLamodiere

composer.json

@@ -11,10 +11,13 @@
         "ext-pgsql": "*",
         "doctrine/doctrine-bundle": "^2.1",
         "guzzlehttp/guzzle": "^7.2",
+        "league/openapi-psr7-validator": "^0.13.0",
+        "nyholm/psr7": "^1.3",
         "symfony/console": "4.4.*",
         "symfony/dotenv": "4.4.*",
         "symfony/flex": "^1.3.1",
         "symfony/framework-bundle": "4.4.*",
+        "symfony/psr-http-message-bridge": "^2.0",
         "symfony/serializer": "4.4.*",
         "symfony/yaml": "4.4.*",
         "webmozart/assert": "^1.9"