OZG-3284 move command code to own module

Jenkinsfile

mail-service/pom.xml

notification-manager/pom.xml

pluto-command/lombok.config

pluto-command/pom.xml

...and/src/main/java/de/itvsh/ozg/pluto/command/Command.java

.../java/de/itvsh/ozg/pluto/command/CommandCreatedEvent.java

...java/de/itvsh/ozg/pluto/command/CommandExecutedEvent.java

...n/java/de/itvsh/ozg/pluto/command/CommandFailedEvent.java

...c/main/java/de/itvsh/ozg/pluto/command/CommandStatus.java

.../java/de/itvsh/ozg/pluto/command/VorgangCreatedEvent.java

pluto-interface/pom.xml

pluto-server/pom.xml

pluto-utils/pom.xml

pom.xml