Get product requirements on function construct

[edwardfoyle]

Several open questions from this thread regarding how we want to support building functions. We need to have a discussion with product around some long-term decisions like relying on Docker for builds, using CDK function build logic vs our own logic, async vs sync building, etc.

[josefaidt]

I was poking through the PR and I really like the idea of providing an option to specify a build command, however I also enjoy CDK's builtin bundling with esbuild. In my experience it's been very easy to get up and running with Node Lambda's in CDK without tweaking bundling options.

relying on Docker for builds

Does this mean we would use Docker to build every time or only when developers specify they want to deploy a containerized Lambda?

vs our own logic,

Would our own logic include an esbuild-based solution? Or would this be something entirely different?