Introduce benchmark for ZIO HTTP API

[jdegoes]

Is your feature request related to a problem? Please describe.

zio.http.api has no benchmark. A variety of benchmarks should be added so that optimization may proceed in a data-driven way.

Describe the solution you'd like

• [x] A benchmark that tests simple request/response of small data
• [ ] A benchmark that tests simple request/response of large data
• [x] A benchmark that tests dispatch to a large number of similar routes (benefits from radix tree)
• [ ] A benchmark that tests performance of unhappy path (no matches)
• [ ] A benchmark that tests performance of unhappy path (malformed data)

Ideally, each benchmark would come with a version for ZIO HTTP API, and another version for an equivalent in the space (e.g. Tapir on Akka HTTP).

Describe alternatives you've considered

None.

[kitlangton]

@adamgfraser and I are taking this

[jdegoes]

🙏