OZG-3956 use jackson for parsing file data

...angsadapter/common/formdata/FormSolutionsTestFactory.java

...p/eingangsadapter/formsolutions/FileDataDeserializer.java

...adapter/formsolutions/FormSolutionsAttachmentsMapper.java

...p/eingangsadapter/formsolutions/FormSolutionsEingang.java

...ter/formsolutions/FormSolutionsRepresentationsMapper.java

...angsadapter/formsolutions/FormSolutionsRequestMapper.java

...ter/formsolutions/FormSolutionsAttachmentsMapperTest.java

...dapter/formsolutions/FormSolutionsEingangTestFactory.java

...sadapter/formsolutions/FormSolutionsFilesTestFactory.java

...formsolutions/FormSolutionsRepresentationsMapperTest.java

...apter/formsolutions/FormSolutionsRequestMapperITCase.java

...adapter/formsolutions/FormSolutionsRequestMapperTest.java

pom.xml

...ebased/formsolutions/FormSolutionsEngineBasedAdapter.java

.../enginebased/formsolutions/FormSolutionsHeaderMapper.java

...k/enginebased/formsolutions/FormSolutionsPanelMapper.java

...ntik/enginebased/formsolutions/IdentifierValueParser.java

...d/formsolutions/FormSolutionsAntragstellerMapperTest.java

...nebased/formsolutions/FormSolutionsHeaderTestFactory.java

...inebased/formsolutions/FormSolutionsPanelTestFactory.java