[node-bridge][build-utils] Add multi payload lambda handling in node-bridge (#7507)

### Related Issues

x-ref: https://github.com/vercel/next.js/pull/34935

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packages/node-bridge/types.ts

@@ -16,6 +16,7 @@ export interface VercelProxyRequest {
   path: string;
   headers: IncomingHttpHeaders;
   body: Buffer;
+  payloads?: Array<VercelProxyRequest>;
 }
 export interface VercelProxyResponse {
   statusCode: number;