feat: global banner entity

.../abstractservice/IndexFielAliasRemoteResourceService.java

...n/java/ch/unige/solidify/model/index/IndexFieldAlias.java

...va/ch/unige/solidify/business/IndexFieldAliasService.java

...l/src/main/java/ch/unige/solidify/model/GlobalBanner.java

...fy-model/src/main/java/ch/unige/solidify/model/Label.java

...del/src/main/java/ch/unige/solidify/model/LargeLabel.java

...rc/main/java/ch/unige/solidify/rest/EmbeddableEntity.java

...ige/solidify/specification/GlobalBannerSpecification.java

...c/main/java/ch/unige/solidify/util/BasicEntityMapper.java

...va/ch/unige/solidify/test/util/BasicEntityMapperTest.java

...il/src/main/java/ch/unige/solidify/SolidifyConstants.java