feat: connect Journal to DB

...ain/java/unipotsdam/gf/modules/journal/model/Journal.java

.../java/unipotsdam/gf/modules/journal/model/JournalDAO.java

...a/unipotsdam/gf/modules/journal/model/JournalDAOImpl.java

...tsdam/gf/modules/journal/service/DummyJournalService.java

...unipotsdam/gf/modules/journal/service/JournalService.java

...otsdam/gf/modules/journal/service/JournalServiceImpl.java

...am/gf/modules/journal/service/ProjectDescriptionImpl.java

...java/unipotsdam/gf/modules/journal/util/JournalUtils.java

.../java/unipotsdam/gf/modules/journal/view/JournalView.java

gemeinsamforschen/src/main/webapp/assets/js/e-portfolio.js

gemeinsamforschen/src/scripts/dbschema/journal.sql