[improvement] API changes for ONNX export and torch.compile(), scatter export WAR

[borisfom]

This PR depends on https://github.com/rapidsai/cugraph-ops/pull/624 We need to discuss/finalize proposed API changes. Export tests added. Legacy ONNX, TRT and TS tests work, also compile(). dynamo_export and export.export() tests should probably be disabled for now.

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[BradReesWork]

/ok to test