Add DelegatingConfigService

Allows for switches between static and dynamic config services without having to change UIDOperatorVerticle

src/main/java/com/uid2/operator/service/DelegatingConfigService.java

@@ -0,0 +1,22 @@
+package com.uid2.operator.service;
+
+import io.vertx.core.json.JsonObject;
+
+import java.util.concurrent.atomic.AtomicReference;
+
+public class DelegatingConfigService implements IConfigService{
+    private AtomicReference<IConfigService> activeConfigService;
+
+    public DelegatingConfigService(IConfigService initialConfigService) {
+        this.activeConfigService = new AtomicReference<>(initialConfigService);
+    }
+
+    public void updateConfigService(IConfigService newConfigService) {
+        this.activeConfigService = new AtomicReference<>(newConfigService);
+    }
+
+    @Override
+    public JsonObject getConfig() {
+        return activeConfigService.get().getConfig();
+    }
+}