build/eval/gen-card scripts for fsmt

[stas00]

Here are the various build/eval/gen scripts used for fsmt. We will use them in the future should any updates/corrections need to be done.

They are also a great starter for porting other similar architectures.

Fixes #7092

[codecov]

Codecov Report

Merging #7155 into master will increase coverage by 3.11%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #7155      +/-   ##
==========================================
+ Coverage   78.44%   81.56%   +3.11%     
==========================================
  Files         168      168              
  Lines       32309    32309              
==========================================
+ Hits        25346    26352    +1006     
+ Misses       6963     5957    -1006     

Impacted Files	Coverage Δ
src/transformers/tokenization_xlnet.py	66.66% <0.00%> (-23.43%)	⬇️
src/transformers/tokenization_ctrl.py	78.64% <0.00%> (-17.48%)	⬇️
src/transformers/modeling_transfo_xl_utilities.py	52.98% <0.00%> (-13.44%)	⬇️
src/transformers/modeling_transfo_xl.py	67.10% <0.00%> (-12.67%)	⬇️
src/transformers/modeling_mobilebert.py	79.21% <0.00%> (-10.25%)	⬇️
src/transformers/modeling_t5.py	76.70% <0.00%> (-6.07%)	⬇️
src/transformers/tokenization_dpr.py	53.15% <0.00%> (-4.51%)	⬇️
src/transformers/modeling_utils.py	86.69% <0.00%> (-0.54%)	⬇️
src/transformers/file_utils.py	82.84% <0.00%> (-0.25%)	⬇️
src/transformers/data/data_collator.py	93.18% <0.00%> (ø)
... and 7 more

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[LysandreJik]

I think this is a nice addition and can be a good reference if newer models are out.

[sgugger]

Good for me too!