Add metrics by route in Express apps

From @msenevir:
1. In an express node.js app, I’d like to see a breakdown of the routes, how long they take, etc.
2. Same thing, but for express middleware
3. I wasn’t able to see any of my postgres queries + was hoping it would pick that up out of the box
4. Data on external services I’m using / how long they take (ex: Amazon S3)
