- Added the `herodo` package to the workspace.
- Updated the MONOREPO_CONVERSION_PLAN.md to reflect
the completion of the herodo package conversion.
- Updated README.md and build_herodo.sh to reflect the
new package structure.
- Created herodo/Cargo.toml, herodo/README.md,
herodo/src/main.rs, herodo/src/lib.rs, and
herodo/tests/integration_tests.rs and
herodo/tests/unit_tests.rs.
