feat(training): scaffold Python training project

Training/pytest.ini

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+[pytest]
+testpaths = tests
+python_files = test_*.py
+addopts = -v

Training/requirements.txt

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+gymnasium>=0.29,<2
+stable-baselines3>=2.3,<3
+torch>=2.2,<3
+onnx>=1.16,<2
+onnxruntime>=1.18,<2
+numpy>=1.24,<3
+tensorboard>=2.15
+pytest>=8