Fix: replace pkg_resources with importlib.metadata for setuptools 82+ by junagent · Pull Request #2144

Fix: replace pkg_resources with importlib.metadata for setuptools 82+ by junagent · Pull Request #2144 · GPflow/GPflow

… compatibility

Fixes GPflow#2143

pkg_resources was removed from setuptools 82.0.0 (PEP 740). This broke
gpflow at runtime - 'import gpflow' fails with:

    ModuleNotFoundError: No module named 'pkg_resources'

Replace pkg_resources.get_distribution() with importlib.metadata.version(),
which is the stdlib equivalent available since Python 3.8.

Verification:
- 'import gpflow' works without pkg_resources
- __version__ correctly returns the installed version
- Falls back to 'develop' when installed in editable mode