Support request and response objects

[rodrigorm]

Following the docs on Vercel (https://vercel.com/docs/runtimes#official-runtimes/node-js) the Node runtimes first use the req/res handler style and support changes to AWS style with configuration, eg: NODEJS_AWS_HANDLER_NAME.

It would be nice if now-deno supports the same APIs style.

[grikomsn]

I'd like to work on this, but I need to learn how now-deno works internally. 🤔

[grikomsn]

Until I know how this builder works, here's a wrapper to create @vercel/node like functions: https://github.com/grikomsn/deno-create-now-fn

[lucacasonato]

@grikomsn If you want you can add this code to this repo and document it in the README :-)

[grikomsn]

I'm still new to Vercel builders. Any pointers on where can I add/modify parts of the code?