Restore event structure before passing it to the lua runtime #706
Description
Related #704
This raises the question of unflattening the event before providing it to the user's Lua script in the lua transform. Without this, the user must access arrays and nested items through our flattened structure. This feels a little strange given that Lua is a runtime and it can work with nested objects and arrays.
I'm not necessarily proposing changes here, but I wanted to think about it as we think through #704, and have this document our decision for posterity.