Research best way to track benchmarks across PRs

[jtescher]

Currently benchmarks are only run manually, would be nice to have a history and possibly fail if there are significant regressions.

[jtescher]

@awiede mentioned https://github.com/marketplace/actions/continuous-benchmark as a possible solution.

[hdost]

https://github.com/benchmark-action/github-action-benchmark/blob/master/.github/workflows/rust.yml

[cijothomas]

Removed from Tracing API stable milestone.