introduce pluto-common and move callcontext there

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

pluto-common/pom.xml

.../main/java/de/itvsh/ozg/pluto/PlutoServerApplication.java

...va/de/itvsh/ozg/pluto/common/callcontext/CallContext.java

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

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

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

...tvsh/ozg/pluto/common/callcontext/CurrentUserService.java

...main/java/de/itvsh/ozg/pluto/common/callcontext/User.java

.../VorgangManagerClientCallContextAttachingInterceptor.java

.../common/callcontext/CallContextHandleInterceptorTest.java

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

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

...zg/pluto/common/callcontext/CurrentUserServiceITCase.java

.../ozg/pluto/common/callcontext/CurrentUserServiceTest.java

...mmon/callcontext/TestCallContextAttachingInterceptor.java

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

...gangManagerClientCallContextAttachingInterceptorTest.java

...TA-INF/services/org.junit.jupiter.api.extension.Extension

pluto-common/src/test/resources/junit-platform.properties