build: use esbuild to generate layer

[pragmaticivan]

Before:

After:

[pragmaticivan]

I might need some help testing this with an alpha layer for the esm module resolution

[pragmaticivan]

It turns out that for ESM, will still need the import-in-the-middle and I the optional source maps are also missing here, although they are optional, so will only be included if the user pass a nodejs flag.

[pragmaticivan]

New Layer Size:

Some files are not included in the runtime.