Mapped the PID for databases

fda-identifier-service/pom.xml

...src/main/java/at/tuwien/endpoints/IdentifierEndpoint.java

...rc/main/java/at/tuwien/endpoints/PersistenceEndpoint.java

...service/rest-service/src/main/resources/templates/doi.xml

...rvices/src/main/java/at/tuwien/config/EndpointConfig.java

...rvices/src/main/java/at/tuwien/config/TemplateConfig.java

...es/src/main/java/at/tuwien/service/IdentifierService.java

...in/java/at/tuwien/service/impl/IdentifierServiceImpl.java

...ain/java/at/tuwien/api/identifier/IdentifierBriefDto.java

...db/api/src/main/java/at/tuwien/api/user/UserBriefDto.java

.../main/java/at/tuwien/entities/identifier/RelatedType.java

...main/java/at/tuwien/entities/identifier/RelationType.java

.../services/src/main/java/at/tuwien/mapper/QueryMapper.java

fda-ui/components/dialogs/Persist.vue

fda-ui/components/dialogs/PersistDatabase.vue

...es/container/_container_id/database/_database_id/info.vue

...tainer_id/database/_database_id/query/_query_id/index.vue