Formatter

[LysandreJik]

Add two new methods to the logging utility to automatically set the format like it is done in the examples/ folder.

[codecov]

Codecov Report

Merging #7368 into master will decrease coverage by 1.34%.
The diff coverage is 22.22%.

@@            Coverage Diff             @@
##           master    #7368      +/-   ##
==========================================
- Coverage   76.51%   75.17%   -1.35%     
==========================================
  Files         181      181              
  Lines       34851    34860       +9     
==========================================
- Hits        26666    26205     -461     
- Misses       8185     8655     +470     

Impacted Files	Coverage Δ
src/transformers/utils/logging.py	79.31% <22.22%> (-6.59%)	⬇️
src/transformers/tokenization_fsmt.py	20.34% <0.00%> (-74.90%)	⬇️
src/transformers/modeling_tf_electra.py	25.32% <0.00%> (-73.63%)	⬇️
src/transformers/modeling_layoutlm.py	25.06% <0.00%> (-69.40%)	⬇️
src/transformers/tokenization_phobert.py	21.80% <0.00%> (-61.66%)	⬇️
src/transformers/tokenization_bart.py	42.10% <0.00%> (-57.90%)	⬇️
src/transformers/tokenization_bert_generation.py	39.28% <0.00%> (-55.36%)	⬇️
src/transformers/trainer.py	13.34% <0.00%> (-42.28%)	⬇️
src/transformers/modeling_tf_gpt2.py	65.38% <0.00%> (-29.59%)	⬇️
src/transformers/training_args.py	62.69% <0.00%> (-28.58%)	⬇️
... and 18 more

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[jplu]

Thanks! LGTM!