feat: add metadata v2 (de)serializers, MetadataExtractorV2,...

feat: [AOU-403] upgrade pivotal metadata format to version 2

https://issues.unige.ch/browse/AOU-403

AoU-ResourceServerCommon/src/test/resources/angular-form-data-v2.json

@@ -79,8 +79,8 @@
     "mandator": "My mandator",
     "academicStructures": [
       {
-        "code": "547",
-        "oldCode": "1",
+        // 'code_struct' is still used for 'code'
+        "code": "1",
         "name": "Faculté des sciences"
       }
     ],