More thorough testing for pickle/unpickle
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feature request
- Dominant language
- Python
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Description
## 🚀 Feature
Add unit tests that load pickled graph from previous releases. The promise is to have backward compatibility for at least two latest releases.
## Motivation
There have been several issues regarding to loading pickled `DGLGraph` from previous releases using new codebase (e.g., #4107). Although we have patched the issue, it exposes the issue of backward compatibility for pickled DGLGraph object.
## Alternatives
Patch whenever users raise issues but result in poor user experience.
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