OZG-6239 KOP-2606 Generate xta identifier in service

...java/de/ozgcloud/xta/test/app/mapper/ExceptionMapper.java

.../java/de/ozgcloud/xta/test/app/mapper/ResponseMapper.java

.../java/de/ozgcloud/xta/test/app/model/XtaCloseRequest.java

...ain/java/de/ozgcloud/xta/test/app/model/XtaConstants.java

src/main/java/de/ozgcloud/xta/test/app/model/XtaFile.java

.../de/ozgcloud/xta/test/app/model/XtaGetMessageRequest.java

...va/de/ozgcloud/xta/test/app/model/XtaMessageMetaData.java

...a/de/ozgcloud/xta/test/app/server/ManagementPortImpl.java

.../java/de/ozgcloud/xta/test/app/server/MsgBoxPortImpl.java

...a/de/ozgcloud/xta/test/app/service/XtaMessageService.java

src/main/java/de/ozgcloud/xta/test/app/util/XtaId.java

...in/java/de/ozgcloud/xta/test/app/util/XtaIdGenerator.java

...ozgcloud/xta/test/app/util/YamlPropertySourceFactory.java

.../java/de/ozgcloud/xta/test/app/validation/ValidXtaId.java

...a/de/ozgcloud/xta/test/app/validation/XtaIdValidator.java

.../de/ozgcloud/xta/test/app/mapper/ExceptionMapperTest.java

...a/de/ozgcloud/xta/test/app/mapper/ResponseMapperTest.java

.../ozgcloud/xta/test/app/server/ManagementPortImplTest.java

...a/de/ozgcloud/xta/test/app/server/MsgBoxPortImplTest.java

.../ozgcloud/xta/test/app/service/XtaMessageServiceTest.java