game & asset "popularity" sorting

[dromzeh]

Implement popularity to each game & asset with a numerical value, the higher being the more popular.

This can be calculated from anonymized analytics from the site & CDN, therefore allowing for sorting by "user engagement".

This will be calculated using D1.

• Implement storing & adding game & asset data
• Collect game & game_asset data
• Implement popularity sort, getting values for game asset & then appending popularity (1 = highest, etc)

Related to wanderer-moe/site#203 - makes sense to be implemented onto the API first.
Requires #5 to be completed beforehand

[dromzeh]

also: make sure entries inside the DB are being updated, even if it's calling from a cached response

[dromzeh]

scrapping in favour of download count in #20