oech3:patch-2

Cargo.toml: Simplify profiles

Rust project using divan benchmarks with codspeed-divan-compat v4.3.0 already configured

All 26 benchmarks pass with codspeed-divan-compat v4.3.0 and codspeed CLI

Created CodSpeed GitHub Actions workflow and added CodSpeed badge to README

CodSpeed workflow completed successfully. 26 benchmarks detected and measured. Installation comment posted on PR #189.

Benchmarks have been successfully run and processed. The results are available in Codspeed