Download statistics 

## Prerequisites

* [x ] I searched to see if the issue already exists.

## Description

This is probably a big ask but it'd be awesome if we could see download statistics for a particular package. 

e.g. https://gobinaries.com/tj/triage/cmd/triage@1.0.0?stats=true

example json resp
```
{
  "total": 10000,
  "week":  125,
 ...
}
```