Added a step to install versioneer with the `--vendor` flag in the CI pipeline. This ensures versioneer is properly set up for managing versioning during builds. The change helps streamline the build and deployment process.

This change updates the .gitlab-ci.yml file to include versioneer in the pipeline dependencies. It ensures proper version management during the build process. The renaming of `versioneer.py` to `versioneer.py.bak` is likely related to this adjustment.

Introduced a `pyproject.toml` file to define project metadata, dependencies, and Python version requirements. Added a `.gitlab-ci.yml` for automated builds and PyPI package uploads in the CI pipeline.