`wmf.setInteractionHandler(interactionHandler)`==Background
Apps need to know information about any user interaction on the mobile-html article page so it can respond appropriately
`interactionHandler ` would be a function that takes a dictionary with `{action: "link", href: "/wiki/otherpage"}` where action is the type of action performed, and other keys in that dictionary are information related to the action. Other examples would be `{action: "edit_section", section_id: 0}` and `{action: "reference", reference_id: "id2", adjacent_reference_ids: ["id1", "id2", "id3"]}`==How
Add `wmf.setInteractionHandler(interactionHandler)` to the JS bridge
`interactionHandler` would be a function that takes a dictionary with a required `action` property that indicates what action was taken. Any other properties are the user information for that action. For example, tapping a link would produce `{action: "link", href: "/wiki/otherpage"}`. Other examples would be `{action: "edit_section", section_id: 0}` and `{action: "reference", reference_id: "id2", adjacent_reference_ids: ["id1", "id2", "id3"]}`.
When the user interacts with the page, the `interactionHandler` is called with the appropriate information.