chore: consolidate version definitions and update release workflow

[Bjarten]

This pull request consolidates version definitions and improves the release workflow to streamline the versioning and publishing processes. The changes are part of an effort to improve maintainability and ensure the workflows are efficient and modular.

Changes Made:

• Consolidated Version Management:

  • Removed duplicate version definitions to maintain a single source of truth. The version is now only defined in early_stopping_pytorch/__init__.py to avoid conflicts.
  • Removed the version field from pyproject.toml, as python-semantic-release handles versioning automatically.

• Updated Release Workflow:

  • Improved the Create New Release workflow by separating the release process from the publishing process.
  • The release process now handles version bumping, tagging, and creating GitHub releases via python-semantic-release.

• New Publish Workflow:

  • A dedicated workflow now handles publishing the package to PyPI when a new version tag is pushed.
  • This ensures a clear separation of responsibilities between creating releases and publishing to PyPI, reducing complexity.