Added three new modules:

Added three new modules:
- spring-boot-admin-swagger: Adds the option to add a Swagger UI under /api-ui via @EnableAdminServerSwagger, which documents the Admin Boot API
- spring-boot-admin-cache: Adds the option to use Hazelcast as a distributed memory-based registry instead of a local registry.
- spring-boot-admin-security: Adds the option the secure the Admin Boot endpoints via @EnableAdminServerSecurity