Add device registry

- add RegistryController
- add DeviceRegistryService
- add Helper.kt
- add device registry property
- set up registry property

src/main/kotlin/ltd/hlaeja/Application.kt

@@ -1,8 +1,13 @@
 package ltd.hlaeja
 
+import ltd.hlaeja.property.DeviceRegistryProperty
 import org.springframework.boot.autoconfigure.SpringBootApplication
+import org.springframework.boot.context.properties.EnableConfigurationProperties
 import org.springframework.boot.runApplication
 
+@EnableConfigurationProperties(
+    DeviceRegistryProperty::class,
+)
 @SpringBootApplication
 class Application