feat!: core api changes

[Hebilicious]

🔗 Linked issue

Fix #77

❓ 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

Renamed the core composable :

• getServerToken => getAuthJsToken
• getServerSession => getAuthJsSession
• NuxtAuthHandler => NuxtAuthJsHandler

Nuxt authJs option baseUrl is now serverUrl, to avoid confusion with Nuxt baseUrl.

Add a defineAuthJsConfig helper.

Improve support for Nuxt baseUrl.

📝 Checklist

• I have linked an issue or discussion.
• I have updated the documentation accordingly.

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