As we are going to implement event logging for the feed and feed customization in T197194, we'd like to modify events sent to MobileWikiAppiOSReadingLists to make them consistent with other feed events sent to MobileWikiAppiOSFeed. Specifically:
- Add fields measure_position and measure_age to identify the position of the article in the list, and the age of the feed
- Distinguish feed card and card detail view
Spec: https://docs.google.com/presentation/d/1SEznC3gKIgzSR0knzfFNJ7LpmFKF3S_u0_HrDDAbYZY/edit?usp=sharing
This task depends on T197194. If there is anything change in T197194, the spec may need to be changed accordingly.