[Feat] Download dataset by using MIM&OpenDataLab

[Ezra-Yu]

Motivation

Download dataset by using MIM&OpenDataLab

relay to open-mmlab/mim#212

Use cases (Optional)

# install OpenDataLab CLI tools
pip install -U opendatalab
# log in OpenDataLab, registry
odl login
# download and preprocess by MIM
mim download mmpretrain --dataset imagenet1k
mim download mmpretrain --dataset cub

Checklist

Before PR:

• Pre-commit or other linting tools are used to fix the potential lint issues.
• Bug fixes are fully covered by unit tests, the case that causes the bug should be added in the unit tests.
• The modification is covered by complete unit tests. If not, please add more unit test to ensure the correctness.
• The documentation has been modified accordingly, like docstring or example tutorials.

After PR:

• If the modification has potential influence on downstream or other related projects, this PR should be tested with those projects, like MMDet or MMSeg.
• CLA has been signed and all committers have signed the CLA in this PR.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (test-1.0@7d850df). Click here to learn what that means.
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Additional details and impacted files

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  Misses              ?     8213           
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Flag	Coverage Δ
unittests	65.51% <0.00%> (?)

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