bring GA dataset page data into db for popularity

[tdlowden]

[NOTE: For individual stories, use the user story template! Only use this template for larger things that will likely break down into a series of smaller stories over time.]

Feature/what we're after

Get GA pageview data into db to feed popularity score

Anticipated/hypothesized benefits

• enable "Smart Rank" sorting
• enable popularity sorting

Measurements/metrics

• [description of a thing that can be monitored or tested to measure and validate when the outcome has been achieved]

References/background

• can we repurpose reports we already save in S3 for /metrics?

[tdlowden]

Plan is to use the 30 days that we currently use for the metrics reports