concurrent scraping

[pipermerriam]

What was wrong?

Currently doing a scrape of the chain is very slow since it does everything synchronously and sequentially.

How can it be fixed?

Since there is a lot of IO, we should be able to leverage concurrency pretty easily for this.

I think either trio or curio are good candidates, leaning slightly towards trio because it's looking like what we'll use for trinity (but really either would be fine since this codebase represents a stand-alone application.