Adds new performance metrics

- duration between early click and replayed click
- duration between replayed/post-replay click and first image display
- duration between replayed/post-replay click and first metadata display

Change-Id: Ia308db7580fd89538b9a9c8b0fea89fa2a4c77d2
Mingle: https://wikimedia.mingle.thoughtworks.com/projects/multimedia/cards/515
Mingle: https://wikimedia.mingle.thoughtworks.com/projects/multimedia/cards/508