[M] Unify BaseHandler

src/main/java/icu/samnyan/aqua/sega/general/BaseHandler.java

@@ -0,0 +1,13 @@
+package icu.samnyan.aqua.sega.general;
+
+import com.fasterxml.jackson.core.JsonProcessingException;
+
+import java.util.Map;
+
+/**
+ * @author samnyan (privateamusement@protonmail.com)
+ */
+public interface BaseHandler {
+
+    String handle(Map<String, Object> request) throws JsonProcessingException;
+}