* refactor: add an hoursBack query param to the raw metrics endpoint
* refactor: explicitly return undefined
* refactor: make parseHoursBackQueryParam non-static
* refactor: add test for hoursBack query param
* refactor: improve arg name
* refactor: add a 1 hour test case
Adds a new way of handling usage metrics where we push it directly to the database and performs aggregation on the fly. All metrics are aggregated in to buckets of hours. We will for now store metrics for the 48 hours with the following dimensions:
- featureName
- projectName
- envrionment
- yes (the actual count)
- no (the actual count)