fix(expo-web-browser): add missing peer dependency on url

[EvanBacon]

Why

• Webpack automatically mocks this on web, but Metro web does not. I built the mocking system in Metro only to realize that simply installing url would fix the issue.

How

Test Plan

• Use expo-web-browser in an Expo Router app on web. It will fail. yarn add url then it will work.

Checklist

• Documentation is up to date to reflect these changes (eg: https://docs.expo.dev and README.md).
• Conforms with the Documentation Writing Style Guide
• This diff will work correctly for expo prebuild & EAS Build (eg: updated a module plugin).