[Sparse] Support converson to/from torch sparse tensor.

[czkkkkkk]

Description

Resolve #5373, #5145.

• Support conversions to/from torch sparse tensor.
• Use the stacked row and column tensor in C++ FromCOO.
• Fix typos in the from_coo, from_csr, from_csc docstrings.

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: fd72a95

Build ID: 1

Status: ❌ CI test failed in Stage [Lint Check].

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Commit ID: 4f0b446

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[frozenbugs]

Related: consider move non-class method to dgl/sparse/sparse_matrix_utils.py

[dgl-bot]

Commit ID: f45209a

Build ID: 3

Status: ⚪️ CI test cancelled due to overrun.

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[dgl-bot]

Commit ID: 6ded6cc3a45e4ff40fbbc08b4dd60efb6125b3ad

Build ID: 4

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

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[dgl-bot]

Commit ID: 18db0d56ceb8686445eb7f024e1ec7f29a840d0d

Build ID: 5

Status: ✅ CI test succeeded.

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