Rewrite action transform in SWC (#47049)
This is almost a rewrite of the transform to simply some logic. For a `"use server"` file we now simply annotate every exported identifier and will later do runtime checks. This is because that we can't statically know the source of exported values.
This rewrite also makes it possible to annotate anonymous arrow functions.
Thanks to @kdy1 for some of the suggestions here.
Closes NEXT-708, closes NEXT-421.
