added metrics for airports, flights and hr

airports-flight-service/pom.xml

...service/src/main/java/cz/muni/fi/pa165/SwaggerConfig.java

...i/fi/pa165/observations/health/CustomHealthIndicator.java

.../cz/muni/fi/pa165/observations/health/HealthProvider.java

...uni/fi/pa165/observations/info/CustomInfoContributor.java

...-flight-service/src/main/resources/application.properties

airports-hr-service/pom.xml

...vice/src/main/java/cz/muni/fi/pa165/hr/SwaggerConfig.java

...i/pa165/hr/observations/health/CustomHealthIndicator.java

.../muni/fi/pa165/hr/observations/health/HealthProvider.java

.../fi/pa165/hr/observations/info/CustomInfoContributor.java

...orts-hr-service/src/main/resources/application.properties

.../src/main/java/cz/muni/fi/pa165/planes/SwaggerConfig.java

airports-service/pom.xml

...src/main/java/cz/muni/fi/pa165/airport/SwaggerConfig.java

...65/airport/observations/health/CustomHealthIndicator.java

.../fi/pa165/airport/observations/health/HealthProvider.java

...a165/airport/observations/info/CustomInfoContributor.java

airports-service/src/main/resources/application.properties