Remove WMTNewsCrawl dataset back to the experimental folder because the URL link is very slow

[zhangguanheng66]

TODO:

• Create test in test/experimental for this

[codecov]

Codecov Report

Merging #1202 (fbd1f51) into master (22ba68d) will increase coverage by 0.17%.
The diff coverage is 88.88%.

@@            Coverage Diff             @@
##           master    #1202      +/-   ##
==========================================
+ Coverage   73.04%   73.21%   +0.17%     
==========================================
  Files          66       67       +1     
  Lines        3676     3689      +13     
==========================================
+ Hits         2685     2701      +16     
+ Misses        991      988       -3     

Impacted Files	Coverage Δ
torchtext/datasets/__init__.py	100.00% <ø> (ø)
...rchtext/experimental/datasets/language_modeling.py	93.33% <50.00%> (+0.11%)	⬆️
torchtext/experimental/datasets/raw/__init__.py	100.00% <100.00%> (ø)
...orchtext/experimental/datasets/raw/wmtnewscrawl.py	70.83% <100.00%> (ø)
torchtext/legacy/data/dataset.py	93.90% <0.00%> (ø)
torchtext/nn/modules/multiheadattention.py	92.40% <0.00%> (ø)
torchtext/legacy/datasets/language_modeling.py	90.38% <0.00%> (ø)
torchtext/data/datasets_utils.py	91.86% <0.00%> (+2.43%)	⬆️

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