fix(cacheEventHandler): provide event.fetch and event.$fetch

[cjpearson]

🔗 Linked issue

Fixes: #1848

Based on: #1968

❓ 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

Based on the comment here, I tried to create the event.fetch utils in same way as in app.ts.

📝 Checklist

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

[cjpearson]

Hi @pi0, do you have any updates on if/when this might be merged? Or if there are changes necessary. Sorry to keep bugging you, but this is an important issue for us since it blocks enabling page caching.

[pi0]

Thanks!