OZG-1527 read grpc metadata from header and fill authentication

...server/src/main/java/de/itvsh/ozg/pluto/command/User.java

...to/common/callcontext/CallContextAuthenticationToken.java

...luto/common/callcontext/CallContextHandleInterceptor.java

...e/itvsh/ozg/pluto/common/callcontext/CallContextUser.java

...va/de/itvsh/ozg/pluto/command/CallContextTestFactory.java

...t/java/de/itvsh/ozg/pluto/command/CommandServiceTest.java

...sh/ozg/pluto/command/CreateCommandRequestTestFactory.java

...test/java/de/itvsh/ozg/pluto/command/UserTestFactory.java

.../common/callcontext/CallContextHandleInterceptorTest.java

.../ozg/pluto/common/callcontext/CallContextTestFactory.java

.../pluto/common/callcontext/CallContextUserTestFactory.java

.../pluto/files/BinaryFilePersistanceWrapperTestFactory.java

...e/itvsh/ozg/pluto/files/BinaryFileRepositoryImplTest.java

...va/de/itvsh/ozg/pluto/files/UploadStreamObserverTest.java

...sh/ozg/pluto/files/UploadedFilesReferenceTestFactory.java