Performance comparison of copystructure.Copy(...) between Wasm and native builds

To build/execute both Wasm and native benchmarks:

./run.sh

Test loads a "largish" example data set from testdata.json, then uses go test benchmarks to measure the performance of copystructure.Copy(...). For both GOOS=wasip1 GOARCH=wasm, and native (GOOS and GOARCH unset) builds.

The Wasm build tends to be significantly slower.

Note: github.com/mitchellh/copystructure is deprecated. The performance difference between Wasm and native code was noticed in existing code using copystructure.Copy(...)

This repo continues to use copystructure.Copy(..) to identify the fundamental difference why Wasm builds may be significantly slow than native.