[Feature] add chartqa

[wangbo-zhao]

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Motivation

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Modification

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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.
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[codecov]

Codecov Report

Patch coverage: 36.34% and project coverage change: -2.84 ⚠️

Comparison is base (f9dcae2) 68.16% compared to head (c20197f) 65.33%.

❗ Current head c20197f differs from pull request most recent head 0cdbaca. Consider uploading reports for the commit 0cdbaca to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #1668      +/-   ##
==========================================
- Coverage   68.16%   65.33%   -2.84%     
==========================================
  Files         295      331      +36     
  Lines       23372    25679    +2307     
  Branches     3713     4093     +380     
==========================================
+ Hits        15932    16777     +845     
- Misses       6880     8291    +1411     
- Partials      560      611      +51     

Flag	Coverage Δ
unittests	65.33% <36.34%> (-2.84%)	⬇️

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

Impacted Files	Coverage Δ
mmpretrain/apis/feature_extractor.py	37.50% <0.00%> (ø)
mmpretrain/apis/image_caption.py	30.64% <0.00%> (ø)
mmpretrain/apis/image_retrieval.py	21.42% <0.00%> (ø)
mmpretrain/apis/visual_grounding.py	27.53% <0.00%> (ø)
mmpretrain/apis/visual_question_answering.py	25.67% <0.00%> (ø)
mmpretrain/datasets/__init__.py	59.09% <0.00%> (-15.20%)	⬇️
mmpretrain/datasets/chartqa.py	0.00% <0.00%> (ø)
mmpretrain/datasets/flickr30k_caption.py	0.00% <0.00%> (ø)
mmpretrain/datasets/flickr30k_retrieval.py	0.00% <0.00%> (ø)
mmpretrain/datasets/gqa_dataset.py	0.00% <0.00%> (ø)
... and 63 more

... and 1 file with indirect coverage changes

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