[Suggestion] Lambda warming support

[bradley-varol]

I think this would be a great feature to add to Fume. I've tested with a fresh create-nuxt-app project and after ~15 minutes of idle, the site takes 15-20s to respond which for most apps/ecommerce/blogs etc is slow enough to lose visitors.

I believe warming is relatively simple with the serverless framework and is a common practise. Is it something you'd consider adding to Fume as a toggle on a per-project basis?