Remove dependency on torchdata.

[frozenbugs]

Description

Starting from torchdata 0.8, the datapipe related code will be removed, we temporarily move the dependency to torch.data, to see whether more deprecation will happen in torch.

Checklist

Please feel free to remove inapplicable items for your PR.

• The PR title starts with [$CATEGORY] (such as [NN], [Model], [Doc], [Feature]])
• I've leverage the tools to beautify the python and c++ code.
• The PR is complete and small, read the Google eng practice (CL equals to PR) to understand more about small PR. In DGL, we consider PRs with less than 200 lines of core code change are small (example, test and documentation could be exempted).
• All changes have test coverage
• Code is well-documented
• To the best of my knowledge, examples are either not affected by this change, or have been fixed to be compatible with this change
• Related issue is referred in this PR
• If the PR is for a new model/paper, I've updated the example index here.

Changes

[dgl-bot]

To trigger regression tests:

• @dgl-bot run [instance-type] [which tests] [compare-with-branch];
  For example: @dgl-bot run g4dn.4xlarge all dmlc/master or @dgl-bot run c5.9xlarge kernel,api dmlc/master

[dgl-bot]

Commit ID: a72a018

Build ID: 1

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Commit ID: 6bb3596

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[dgl-bot]

Commit ID: 0b570a4fe453118afa7b207177b796f8359d14fc

Build ID: 3

Status: ❌ CI test failed in Stage [Torch CPU (Win64) Unit test].

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Commit ID: ebcb109ff18140f5b4050bf10aaaeb18f24b7828

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Commit ID: 2ec0696c26e45b5e4f773390005e9b02b07c1366

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[dgl-bot]

Commit ID: 2e4956c

Build ID: 8

Status: ❌ CI test failed in Stage [Torch CPU (Win64) Unit test].

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[mfbalin]

@dgl-bot

[dgl-bot]

Commit ID: 2e4956c

Build ID: 9

Status: ⚪️ CI test cancelled due to overrun.

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[dgl-bot]

Commit ID: bdf9947

Build ID: 10

Status: ❌ CI test failed in Stage [Torch GPU Unit test].

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Commit ID: 378f22625f0c06a4872061fb906619420efa4f2a

Build ID: 11

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Commit ID: 4d5ec4a129f71fc9ceb01495ffd83973c48d0c99

Build ID: 12

Status: ✅ CI test succeeded.

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[dgl-bot]

Commit ID: 6955591

Build ID: 13

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[Rhett-Ying]

LGTM. please remember to remove other torchdata related code such as setup.py, dev.yaml.template and others after merging this PR.