[Feature] Add CocoTextv2 to dataset preparer

[xinke-wang]

Visualized by browse_dataset.py #1503

[codecov]

Codecov Report

Base: 85.84% // Head: 85.62% // Decreases project coverage by -0.22% ⚠️

Coverage data is based on head (b1488c9) compared to base (b1a3b94).
Patch coverage: 9.52% of modified lines in pull request are covered.

❗ Current head b1488c9 differs from pull request most recent head 9c8555b. Consider uploading reports for the commit 9c8555b to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           dev-1.x    #1514      +/-   ##
===========================================
- Coverage    85.84%   85.62%   -0.23%     
===========================================
  Files          159      158       -1     
  Lines         9929     9892      -37     
  Branches      1377     1374       -3     
===========================================
- Hits          8524     8470      -54     
- Misses        1159     1176      +17     
  Partials       246      246              

Flag	Coverage Δ
unittests	85.62% <9.52%> (-0.23%)	⬇️

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

Impacted Files	Coverage Δ
mmocr/datasets/preparers/parsers/coco_parser.py	20.45% <9.52%> (-11.55%)	⬇️
...cr/models/textdet/module_losses/pan_module_loss.py	89.10% <0.00%> (-7.70%)	⬇️
mmocr/utils/bbox_utils.py	60.24% <0.00%> (-1.61%)	⬇️
...r/models/kie/postprocessors/sdmgr_postprocessor.py	91.17% <0.00%> (-1.48%)	⬇️
mmocr/apis/inferencers/mmocr_inferencer.py	16.81% <0.00%> (-0.73%)	⬇️
mmocr/datasets/preparers/parsers/base.py	72.00% <0.00%> (ø)
mmocr/datasets/preparers/data_obtainer.py	20.73% <0.00%> (ø)
mmocr/datasets/preparers/parsers/svt_parser.py
mmocr/datasets/preparers/data_converter.py	21.00% <0.00%> (+0.39%)	⬆️
mmocr/datasets/transforms/textdet_transforms.py	91.79% <0.00%> (+0.52%)	⬆️
... and 1 more

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[gaotongxiao]

Need to add config_generator to the end of each config. Same for other PRs