feat: export cookie utilities from undici

[Copilot]

Re-export undici's Cookie API from urllib.

• Export getCookies, setCookie, getSetCookies, deleteCookie, parseCookie functions and Cookie type from src/index.ts
• Add tests for all five cookie utilities

import { getCookies, setCookie, getSetCookies, deleteCookie, parseCookie, Headers } from 'urllib';
import type { Cookie } from 'urllib';

const headers = new Headers();
setCookie(headers, { name: 'foo', value: 'bar' });
const cookies = getSetCookies(headers); // [{ name: 'foo', value: 'bar' }]

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• http://registry.npmjs.org:80/urllib/latest
  • Triggering command: /opt/hostedtoolcache/node/24.14.1/x64/bin/node /opt/hostedtoolcache/node/24.14.1/x64/bin/node --experimental-import-meta-resolve --require /home/REDACTED/work/urllib/urllib/node_modules/.pnpm/@voidzero-dev+vite-plus-test@0.1.15_@arethetypeswrong+core@0.18.2_@types+node@22.19.15__7c6ae394869a5d43fd0cf7dc1d33dc1c/node_modules/@voidzero-dev/vite-plus-test/suppress-warnings.cjs --conditions node --conditions development /home/REDACTED/work/urllib/urllib/node_modules/.pnpm/@voidzero-dev+vite-plus-test@0.1.15_@arethetypeswrong+core@0.18.2_@types+node@22.19.15__7c6ae394869a5d43fd0cf7dc1d33dc1c/node_modules/@voidzero-dev/vite-plus-test/dist/workers/forks.js (http block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

[pkg-pr-new]

Open in StackBlitz

npm i https://pkg.pr.new/node-modules/urllib@742

commit: 5629627

[pkg-pr-new]

Open in StackBlitz

npm i https://pkg.pr.new/node-modules/urllib@742

commit: 5629627

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.60%. Comparing base (ca63296) to head (5629627).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #742   +/-   ##
=======================================
  Coverage   94.60%   94.60%           
=======================================
  Files          10       10           
  Lines         723      723           
  Branches      226      226           
=======================================
  Hits          684      684           
  Misses         36       36           
  Partials        3        3           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.