Runtime Performance Testing

[chriseppstein]

We need a framework for runtime perf testing an ember application using tracerbench along with documentation for how to run the perf tests and get reliable numbers.

Once this exists, we need to use it to evaluate #503 and see if it's a performance win.

[chriseppstein]

here's an example of an ember app that is using tracerbench: https://github.com/emberobserver/client/search?q=performance.mark&unscoped_q=performance.mark

[chriseppstein]

Here's an example config of using tracerbench to perform regression analysis using github actions: https://github.com/glimmerjs/glimmer-vm/blob/master/.github/workflows/perf.yml#L41