[Feature] Add support for VizWiz dataset.

[yyk-wew]

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Motivation

Add support for VizWiz dataset.

Modification

Please briefly describe what modification is made in this PR.

BC-breaking (Optional)

Does the modification introduce changes that break the backward compatibility of the downstream repositories?
If so, please describe how it breaks the compatibility and how the downstream projects should modify their code to keep compatibility with this PR.

Use cases (Optional)

If this PR introduces a new feature, it is better to list some use cases here and update the documentation.

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.

[CLAassistant]

All committers have signed the CLA.

[codecov]

Codecov Report

Patch coverage: 42.76% and project coverage change: -1.31 ⚠️

Comparison is base (f9dcae2) 68.16% compared to head (5a76048) 66.85%.

❗ Current head 5a76048 differs from pull request most recent head e4edec2. Consider uploading reports for the commit e4edec2 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #1636      +/-   ##
==========================================
- Coverage   68.16%   66.85%   -1.31%     
==========================================
  Files         295      311      +16     
  Lines       23372    24659    +1287     
  Branches     3713     3913     +200     
==========================================
+ Hits        15932    16487     +555     
- Misses       6880     7568     +688     
- Partials      560      604      +44     

Flag	Coverage Δ
unittests	66.85% <42.76%> (-1.31%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
mmpretrain/apis/image_retrieval.py	21.42% <ø> (ø)
mmpretrain/datasets/__init__.py	63.41% <0.00%> (-10.88%)	⬇️
mmpretrain/datasets/gqa_dataset.py	0.00% <0.00%> (ø)
mmpretrain/datasets/nocaps.py	0.00% <0.00%> (ø)
mmpretrain/datasets/ocr_vqa.py	0.00% <0.00%> (ø)
mmpretrain/datasets/scienceqa.py	0.00% <0.00%> (ø)
mmpretrain/datasets/textvqa.py	0.00% <0.00%> (ø)
mmpretrain/datasets/vizwiz.py	0.00% <0.00%> (ø)
mmpretrain/datasets/vsr.py	0.00% <0.00%> (ø)
mmpretrain/models/classifiers/image.py	89.83% <0.00%> (-3.16%)	⬇️
... and 33 more

... and 1 file with indirect coverage changes

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