[Feat] add text spotter dataset

[Harold-lkk]

[codecov[bot]]

Codecov Report

Merging #682 (7e751dd) into main (abbae7b) will decrease coverage by 1.07%. The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main     #682      +/-   ##
==========================================
- Coverage   85.30%   84.23%   -1.08%     
==========================================
  Files         163      165       +2     
  Lines       10505    10654     +149     
  Branches     1584     1622      +38     
==========================================
+ Hits         8961     8974      +13     
- Misses       1200     1336     +136     
  Partials      344      344              

Flag	Coverage Δ
unittests	84.23% <0.00%> (-1.08%)	:arrow_down:

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

Impacted Files	Coverage Δ
mmocr/datasets/text_spotter_dataset.py	0.00% <0.00%> (ø)
mmocr/apis/utils.py	76.00% <0.00%> (-12.34%)	:arrow_down:
mmocr/apis/inference.py	64.00% <0.00%> (-4.38%)	:arrow_down:
mmocr/models/textrecog/convertors/seg.py	91.78% <0.00%> (-2.74%)	:arrow_down:
mmocr/models/textrecog/decoders/sar_decoder.py	89.94% <0.00%> (ø)
mmocr/apis/test.py	11.62% <0.00%> (ø)
mmocr/datasets/pipelines/ocr_transforms.py	67.48% <0.00%> (+0.13%)	:arrow_up:
mmocr/utils/ocr.py	75.86% <0.00%> (+0.51%)	:arrow_up:

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