Set up matrix-based performance testing

[jeffbcross]

We should be able to performance test different measurements with different variables.

Things to measure:

• Time to first interaction on first page load
• Time to first interaction on subsequent page load
• FPS of interactions with certain components

Variables

• With service-worker caching
• With HTTP/2 server
• With throttling
• With Web Worker
• With bundle or with unbundled library

[jeffbcross]

Should be able to get a good start on this, but probably won't have all variants tested yet.

[jeffbcross]

I'm going to close this and open up a new issue, since the complex performance testing should be done outside of this repository inside the github.com/bowww org.