continuous benchmarking

[yliang412]

We need to keep track of optd's performance.

Tasks

• https://github.com/cmu-db/optd/pull/262
• CI + pages setup via https://github.com/benchmark-action/github-action-benchmark

[epompeii]

@yliang412 if you are looking to use Criterion + github-action-benchmark, you will need to run in compat mode: benchmark-action/github-action-benchmark#8
Depending on your use case this may not be desirable.

I'm more than happy to help answer any questions to get you all set up with Bencher, which has full Criterion support.