Add features: custom server and websocket. Minor refactoring

src/types/index.ts

@@ -1,4 +1,4 @@
-import type { MatchedRoute, Server } from "bun";
+import type { MatchedRoute, ServeOptions, Server, WebSocketHandler } from "bun";
 import type { FC, JSX, ReactNode } from "react";
 
 export type ServerProps = {
@@ -52,6 +52,8 @@ export type BunextConfig = {
         params: BunextConfigMiddlewareParams,
     ) => Promise<Response | undefined> | Response | undefined;
     defaultCacheExpiry?: number;
+    websocket?: WebSocketHandler<any>;
+    serverOptions?: ServeOptions;
 };
 
 export type BunextConfigMiddlewareParams = {