Remove dependencies on deprecated `//python/dgl/_dataloading`

[Rhett-Ying]

🚀 Feature

For now, DistDataLoader still depends on deprecated classes under //python/dgl/_dataloading. We should use latest dataloading module.

Related issue: https://github.com/dmlc/dgl/issues/4115

Motivation

unified code logic is more friendly for maintain.

Alternatives

replace _dataloading.NodeCollator/EdgeCollator with dataloading.CollateWrapper.

Pitch

Additional context

[github-actions[bot]]

This issue has been automatically marked as stale due to lack of activity. It will be closed if no further activity occurs. Thank you