more coherent naming of db + container service

...database-service/.mvn/wrapper/MavenWrapperDownloader.java

fda-database-service/.mvn/wrapper/maven-wrapper.jar

fda-database-service/.mvn/wrapper/maven-wrapper.properties

fda-database-service/Dockerfile

fda-database-service/api/pom.xml

...service/api/src/main/java/at/tuwien/dto/IpAddressDto.java

.../main/java/at/tuwien/dto/container/ContainerBriefDto.java

...i/src/main/java/at/tuwien/dto/container/ContainerDto.java

.../main/java/at/tuwien/dto/container/ContainerStateDto.java

...rc/main/java/at/tuwien/dto/database/DatabaseBriefDto.java

...c/main/java/at/tuwien/dto/database/DatabaseChangeDto.java

...c/main/java/at/tuwien/dto/database/DatabaseCreateDto.java

...rvice/api/src/main/java/at/tuwien/dto/image/ImageDto.java

...pi/src/main/java/at/tuwien/dto/image/ImageEnvItemDto.java

fda-database-service/gateway/pom.xml

...ce/gateway/src/main/java/at/tuwien/config/RestClient.java

...ay/src/main/java/at/tuwien/endpoint/ContainerGateway.java

.../java/at/tuwien/exception/ExternalComponentException.java

.../java/at/tuwien/exception/ImageNotSupportedException.java

fda-database-service/mvnw