enh(#880): add signInHeaders param to SignIn

[dangercris]

🔗 Linked issue

closes #880

❓ Type of change

• 📖 Documentation (updates to the documentation, readme or JSdoc annotations)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality like performance)
• ✨ New feature (a non-breaking change that adds functionality)
• 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

This Pull Request introduces enhancements to the sign-in functionality by enabling the inclusion of custom headers in the login request. The change is made to improve the flexibility and scalability of the sign-in process, allowing additional headers to be passed as part of the request for various purposes such as API versioning, custom authentication tokens, and enhanced security measures.

Key Changes

• Custom Headers Support: The signIn function now accepts a signInHeaders parameter, which can be used to pass custom headers in the sign-in request.
• Fallback to Default Headers: If no custom headers are provided, the function defaults to an empty object, maintaining backward compatibility.

📝 Checklist

• I have linked an issue or discussion.
• I have added tests (if possible).
• I have updated the documentation accordingly.

[pkg-pr-new]

commit: 1ee3cd2

pnpm add https://pkg.pr.new/@sidebase/nuxt-auth@881

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