OZG-532 build and send encrypted zip file

pluto-server/pom.xml

...c/main/java/de/itvsh/ozg/pluto/files/GrpcFileService.java

...ver/src/main/java/de/itvsh/ozg/pluto/vorgang/Eingang.java

...in/java/de/itvsh/ozg/pluto/vorgang/VorgangRepository.java

.../de/itvsh/ozg/pluto/vorgang/redirect/RedirectRequest.java

.../de/itvsh/ozg/pluto/vorgang/redirect/RedirectService.java

...e/itvsh/ozg/pluto/vorgang/redirect/ZipBuilderService.java

.../java/de/itvsh/ozg/pluto/PlutoServerApplicationTests.java

.../java/de/itvsh/ozg/pluto/files/FilesRepositoryITCase.java

.../java/de/itvsh/ozg/pluto/files/GrpcFileServiceITCase.java

...t/java/de/itvsh/ozg/pluto/vorgang/EingangTestFactory.java

...a/de/itvsh/ozg/pluto/vorgang/IncomingFileTestFactory.java

...itvsh/ozg/pluto/vorgang/redirect/RedirectServiceTest.java

...vsh/ozg/pluto/vorgang/redirect/ZipBuilderServiceTest.java