Keep Python version info out of the source tree

[Daniiiil1]

Summary

Pass setuptools' finalized build_lib path into the version-info generator instead of always deriving an output directory from the process working directory.

Root cause

ament_python invokes setup.py from the package source directory. Building the path from os.getcwd() therefore creates <source>/build/version_info.yaml and leaves the checkout dirty even when colcon is configured for an out-of-source build.

The optional build_dir argument preserves the existing fallback for direct callers while GenerateVersionInfoCommand uses the correct setuptools build location. Installation to share/<package> is unchanged.

Validation

• python3 -m py_compile isaac_ros_common/scripts/isaac_ros_common-version-info.py
• mocked generator invocation verified that the YAML path is under the supplied build directory and that no source-tree build directory is created

Closes #239