[DO NOT REVIEW] Retire legacy codes

[zhangguanheng66]

[codecov[bot]]

Codecov Report

Merging #982 into master will decrease coverage by 0.47%. The diff coverage is 82.02%.

@@            Coverage Diff             @@
##           master     #982      +/-   ##
==========================================
- Coverage   77.67%   77.19%   -0.48%     
==========================================
  Files          44       53       +9     
  Lines        3099     3192      +93     
==========================================
+ Hits         2407     2464      +57     
- Misses        692      728      +36     

Impacted Files	Coverage Δ
torchtext/data/batch.py	60.00% <0.00%> (-11.43%)	:arrow_down:
torchtext/data/dataset.py	55.55% <0.00%> (-38.28%)	:arrow_down:
torchtext/data/example.py	54.54% <0.00%> (-31.17%)	:arrow_down:
torchtext/data/field.py	53.84% <0.00%> (-38.99%)	:arrow_down:
torchtext/data/iterator.py	60.00% <0.00%> (-2.67%)	:arrow_down:
torchtext/data/pipeline.py	50.00% <0.00%> (-50.00%)	:arrow_down:
torchtext/legacy/datasets/babi.py	21.27% <ø> (ø)
torchtext/legacy/datasets/imdb.py	48.38% <ø> (ø)
torchtext/legacy/datasets/nli.py	49.29% <ø> (ø)
torchtext/legacy/datasets/sequence_tagging.py	38.29% <ø> (ø)
... and 25 more

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