refactor get_document so it's possible to add more complex features, such as preprocessed fields #17
Description
after jazzdotdev/flute#156, add #16
- https://github.com/lighttouch-packages/json-interface/blob/66e0f094f813c3d2e77bd50cbd6b5c9775f0affb/actions/get_document.lua
- https://github.com/lighttouch-packages/json-interface/blob/66e0f094f813c3d2e77bd50cbd6b5c9775f0affb/rules/request_document.lua
actions shouldn't have IF phrases
multiple conditions (in the action) and in the single exiting rule point to the need for 156