Consider generating SDK using `buf`

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The buf toolchain is used by OpenTDF. buf is "a modern toolchain for working with Protocol Buffers (the IDL used by gRPC)"

Information about generating a Python SDK with buf is available:

• https://buf.build/docs/bsr/generated-sdks/python/
• https://buf.build/docs/bsr/generated-sdks/tutorial/

Additional resources that may be useful:

1. https://github.com/arunaengine/python-api/blob/main/.github/workflows/main.yml
2. https://github.com/serverless/dashboard/blob/main/.github/workflows/python-sdk-schema-publish.yaml#L8-L61
3. https://github.com/sift-stack/sift/blob/main/docs/python.md
4. https://github.com/sift-stack/sift/blob/main/buf_templates/buf.gen.python.yaml
5. https://github.com/sift-stack/sift/blob/main/scripts/setup.py

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Experimentation work is underway, see: #50