feat(elements): Add support for redirect_url URL parameter

[dstaley]

Description

This PR adds support for ?redirect_url in Elements to both sign in and sign up.

Testing Instructions

• While running theme builder, navigate to http://localhost:3000/sign-in?redirect_url=/404
• Sign in
• Confirm that you're navigated to http://localhost:3000/404?redirect_url=%2F404
• Repeat steps for Sign Up

Notes

It really feels like this behavior should be delegated to clerk-js, possibly in the form of updating buildAfterSignInUrl to take in parameters such as redirect_url. Currently buildAfterSignInUrl only captures parameters when Clerk is initialized, not at the time of authentication.

Fixes SDKI-295

Checklist

• npm test runs as expected.
• npm run build runs as expected.
• (If applicable) JSDoc comments have been added or updated for any package exports
• (If applicable) Documentation has been updated

Type of change

• 🐛 Bug fix
• 🌟 New feature
• 🔨 Breaking change
• 📖 Refactoring / dependency upgrade / documentation
• other:

[changeset-bot]

🦋 Changeset detected

Latest commit: 285fce1

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@clerk/elements	Patch

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[Adrastopoulos]

This doesn't work with absolute URLs, only relative.