fix(zod-openapi): Export Hook in @hono/zod-openapi (#313)

.changeset/nervous-berries-invent.md

@@ -0,0 +1,5 @@
+---
+'@hono/zod-openapi': patch
+---
+
+change: Export Hook in @hono/zod-openapi

packages/zod-openapi/src/index.ts

@@ -134,7 +134,7 @@ type OutputType<R extends RouteConfig> = R['responses'] extends Record<infer _,
     : {}
   : {}
 
-type Hook<T, E extends Env, P extends string, O> = (
+export type Hook<T, E extends Env, P extends string, O> = (
   result:
     | {
         success: true