feat: implemented Group and Project DB access and interface

...in/java/unipotsdam/gf/core/database/GFDatabaseConfig.java

.../java/unipotsdam/gf/core/database/mysql/MysqlConnect.java

...otsdam/gf/core/database/mysql/VereinfachtesResultSet.java

...c/main/java/unipotsdam/gf/core/management/Management.java

...in/java/unipotsdam/gf/core/management/ManagementImpl.java

...n/java/unipotsdam/gf/core/management/project/Project.java

...rc/main/java/unipotsdam/gf/core/management/user/User.java

...ava/unipotsdam/gf/core/management/user/UserInterests.java

.../java/unipotsdam/gf/core/management/user/UserProfile.java

...rc/main/java/unipotsdam/gf/interfaces/ResearchReport.java

gemeinsamforschen/src/scripts/dbschema/createDummyUser.sql

gemeinsamforschen/src/scripts/dbschema/fltrail.sql

gemeinsamforschen/src/scripts/dbschema/fltrail_users.sql

...rc/test/java/unipotsdam/gf/interfaces/ManagementTest.java