List new FlatBuffers, YAML, and MessagePack-CSharp experiment rows

[leo-gan]

Summary

• Experiment-only, after harness #106.
• Experiment 7: Java flatbuffers, capnproto, protobuf.
• Experiment 8: YAML vs JSON in Python, Java, JS, Rust, C, C++.
• Experiments 2 and 10: C# MessagePack-CSharp.

How to read

• Times in two languages are not one contest.
• YAML is a file format here: it is slower than JSON in every language we ran.

Findings (this machine)

• Java Sample A: FlatBuffers 416 B / 45.4 µs write+read; Cap’n Proto 376 B / 90 µs; protobuf 155 B / 62.8 µs.
• YAML vs JSON Sample A: Python 1372 µs vs 5.16 µs; same story in the other five languages.
• C# MessagePack-CSharp: 72 B on Sample B (N=1) vs SpanJson 157 B.

Validation

• Timed runs completed for the listed languages. Experiment logs stay local.