Add job offer applications export

src/main/java/nl/tudelft/tam/cache/CoreCacheManager.java

src/main/java/nl/tudelft/tam/cache/PersonCacheManager.java

src/main/java/nl/tudelft/tam/cache/TimedCacheManager.java

...in/java/nl/tudelft/tam/controller/JobOfferController.java

src/main/java/nl/tudelft/tam/service/CSVService.java

src/main/java/nl/tudelft/tam/service/JobOfferService.java

src/main/resources/application.template.yaml

src/main/resources/messages.properties

src/main/resources/templates/job_offer/view_one.html

...ava/nl/tudelft/tam/controller/JobOfferControllerTest.java

src/test/java/nl/tudelft/tam/service/CSVServiceTest.java

src/test/java/nl/tudelft/tam/service/FileServiceTest.java

...test/java/nl/tudelft/tam/service/JobOfferServiceTest.java

src/test/resources/application.yaml