Refactor dispatch (now called HTTP) server (pt. 1)

src/main/java/emu/grasscutter/server/http/Router.java

@@ -0,0 +1,16 @@
+package emu.grasscutter.server.http;
+
+import express.Express;
+import io.javalin.Javalin;
+
+/**
+ * Defines routes for an {@link Express} instance.
+ */
+public interface Router {
+    
+    /**
+     * Called when the router is initialized by Express.
+     * @param express An Express instance.
+     */
+    void applyRoutes(Express express, Javalin handle);
+}