Make core starter objects accessible in the app starter

## Feature Request

### Description of Problem:
When creating an extension app project (maven or gradle) depending solely on symphony-bdk-app-spring-boot-starter, one cannot access beans declared in symphony-bdk-core-spring-boot-starter like `@Slash`.
Reason is: symphony-bdk-app-spring-boot-starter depends on symphony-bdk-core-spring-boot-starter as a runtime dependency

### Potential Solutions:
Make symphony-bdk-app-spring-boot-starter depends on symphony-bdk-core-spring-boot-starter as a compile dependency