Add support for different server adapters

[mgm1313]

Similar to TRPC, it would be great to not only use the built-in standalone server currently provided by Skiffa, but also to integrate it within an existing Fastify or Hono server (in our case). The reason for this is that the server has enough capacity to handle tasks such as cron jobs, incoming webhooks, and processing queues, and implementing those tasks is more enjoyable with these frameworks. Another reason would be to support a serverless environment, perhaps? Anyway, cool stuff!

[mgm1313]

My first request would be: https://vercel.com/docs/functions

It also supports streaming!
And if the output could be CommonJS we also benefit from bytecode caching