Generate an AST for the exported functions in a language-package that can be read by Open Function's front-end to provide users with click-to-add function assistance for writing job expressions.
This is normally called by the bundle script of OpenFn's language-packages
module after the adaptor is built but before it is tarballed for a release.
node ./lib/generate.js --adaptor ~/language-http/src/Adaptor.js --output ./tmp/ast.json