[Dataset] Add peptides functional dataset in LRGB

[paoxiaode]

Description

The peptides functional dataset based on DGLDataset
Related issue: #5352

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

Changes

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[frozenbugs]

@rudongyu please take another round of review.

[rudongyu]

LGTM except for a minor naming issue. Good Work！

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