feat: Add herodo package to workspace

- 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.

build_herodo.sh

@@ -6,10 +6,12 @@ cd "$(dirname "${BASH_SOURCE[0]}")"
 
 rm -f ./target/debug/herodo
 
-# Build the herodo project
-echo "Building herodo..."
-cargo build --bin herodo
-# cargo build --release --bin herodo
+# Build the herodo project from the herodo package
+echo "Building herodo from herodo package..."
+cd herodo
+cargo build
+# cargo build --release
+cd ..
 
 # Check if the build was successful
 if [ $? -ne 0 ]; then