add codspeed benchmark runner

[anonrig]

Completes the work started by @art049 at #4137

[codspeed-hq]

CodSpeed Performance Report

Congrats! CodSpeed is installed 🎉

🆕 0 new benchmarks were detected.

You will start to see performance impacts in the reports once the benchmarks are run from your default branch.

Detected benchmarks

[danlapid]

CodSpeed Performance Report

Congrats! CodSpeed is installed 🎉

🆕 10 new benchmarks were detected.

You will start to see performance impacts in the reports once the benchmarks are run from your default branch.

Detected benchmarks

• ParseAndSerialize (17.7 µs)
• Serialize (4.4 µs)
• constructor[ApiHeaders] (27.9 µs)
• SlowAPIWithLock[FastMethodFixture] (3.7 ms)
• SlowAPI[FastMethodFixture] (4 ms)
• request[GlobalScopeBenchmark] (331 µs)
• Test_JSON_DEC (74.4 µs)
• Test_JSON_ENC (43.7 µs)
• Parse[KjHeaders] (8.8 µs)
• request[RegExpBenchmark] (7.2 ms)

These numbers are likely too small to be used for performance comparisons, I think aiming for 5-10ms per benchmark test is likely a good starting point, microseconds benchmarks likely need more iterations

[anonrig]

These numbers are likely too small to be used for performance comparisons, I think aiming for 5-10ms per benchmark test is likely a good starting point, microseconds benchmarks likely need more iterations

Agreed. I think we should make an update to all benchmarks after this pull-request lands. Most of those benchmarks are not needed, but I'm pretty sure it's up to the discussion.