Use importlib.metadata instead of pkg_resources since deprecated

[chezou]

See: https://setuptools.pypa.io/en/latest/pkg_resources.html

Suppress the following warning

============================================================================ warnings summary =============================================================================
pytd/query_engine.py:6
  /Users/ariga/src/pytd/pytd/query_engine.py:6: DeprecationWarning: pkg_resources is deprecated as an API. See https://setuptools.pypa.io/en/latest/pkg_resources.html
    import pkg_resources

-- Docs: https://docs.pytest.org/en/stable/how-to/capture-warnings.html