feat: add support for PyTorch Lightning

graphstorm-lightning/.gitignore

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+# Byte-compiled / optimized / DLL files
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+*.py[cod]
+*$py.class
+
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graphstorm-lightning/README.md

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+# GraphStorm Support for PyTorch Lightning
+
+Provides essential wrappers for GraphStorm constructs to run training using [PyTorch Lightning](https://lightning.ai/docs/pytorch/stable/).

graphstorm-lightning/examples/README.md

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+# Setup
+
+1. Run `poetry install --with dev`
+1. Run `poetry run python -m ipykernel install --user --name=graphstorm_lightning`
+1. Run `poetry run jupyter notebook`
+1. Open an example notebook
+1. In `Kernel -> Change Kernel` choose `graphstorm_lightning`