feat: support farm plugin

[ErKeLost]

🔗 Linked issue

close #340

❓ 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

📝 Checklist

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

[ErKeLost]

Hi @antfu Farm has released 1.0.0-beta! At this exciting moment, I think we are ready. I feel like we are ready to move forward.

[ErKeLost]

The document has also been modified to complete the home page. I added the features of rolldown and farm I don't know if you agree to do this.

[antfu]

Looks good to me, thank you! @ErKeLost Is that ok for us to ping you when we have issues regarding the farm integration, if any, later on?

[ErKeLost]

@antfu I am very happy to integrate unplugin, because unplugin directly transforms into a farm's js plugin, which is different from directly using vite's plugin logic, so unplugin will be an important part of the farm ecosystem. I am also very willing to grow together with unplugin. If there are any issues, I will solve them as soon as possible.