refactor: use named export

src/function/index.ts

@@ -2,4 +2,4 @@ export { Context as HandlerContext } from './context.js'
 export { Event as HandlerEvent } from './event.js'
 export { BuilderHandler, Handler, BackgroundHandler, HandlerCallback, StreamingHandler } from './handler.js'
 export { BuilderResponse, Response as HandlerResponse, StreamingResponse } from './response.js'
-export * from './v2.js'
+export { Context } from './v2.js'