Add app navigation/deep link actions when the user taps a notification cell.
- Set up notifications routing logic (per type, what is the destination view controller?)
- Add primary "on tap" action per notification cell
- Ensure primary action presentation style pushes destination on to navigation stack (as makes sense)
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**Product/Design Needs:**
[1] Can we have a precise and specific list of where in the existing app to route the user to per notification type on cell tap (primary action)?
**Engineering Needs:**
[1] API contract with data model representing all notifications/notifications controller
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===Designs
{F34631173 width=500}
===Mappings
Link mappings for notification cells: https://docs.google.com/spreadsheets/d/10Gkjd6GWFNDXzPnZhDJ2NvPqNvqoTTCFHMnSUtf3ex8/edit?usp=sharing
===Dependencies
https://phabricator.wikimedia.org/T287298