OZG-4087 OZG-4144 implement api for exporting Vorgang

.gitignore

alfa-xdomea/src/main/java/de/ozgcloud/xdomea/ExportData.java

...domea/src/main/java/de/ozgcloud/xdomea/XDomeaService.java

...a/src/test/java/de/ozgcloud/xdomea/XDomeaServiceTest.java

goofy-server/pom.xml

.../alfa/vorgangexport/VorgangExportByVorgangController.java

...a/vorgangexport/VorgangExportByVorgangControllerTest.java

http-client/auth.http

http-client/dms.http

http-client/http-client.env.json