OZG-6735 extract antragsteller mapping; refactor util and service

...ain/java/de/ozgcloud/eingang/fim/AntragstellerMapper.java

...rc/main/java/de/ozgcloud/eingang/fim/FimBasedAdapter.java

...er/src/main/java/de/ozgcloud/eingang/fim/FimDataUtil.java

...in/java/de/ozgcloud/eingang/fim/FimEngineBasedMapper.java

...va/de/ozgcloud/eingang/fim/FimSchemeAdapterCatalogue.java

...main/java/de/ozgcloud/eingang/fim/FimSchemeCatalogue.java

...ain/java/de/ozgcloud/eingang/fim/FimSchemeIdentifier.java

...ter/src/main/java/de/ozgcloud/eingang/fim/FimService.java

...gcloud/eingang/fim/common/errorhandling/FimException.java

...java/de/ozgcloud/eingang/fim/AntragstellerMapperTest.java

...ava/de/ozgcloud/eingang/fim/AntragstellerTestFactory.java

...rc/test/java/de/ozgcloud/eingang/fim/FimDataUtilTest.java

...c/test/java/de/ozgcloud/eingang/fim/FimServiceITCase.java