[Benchmark] Extend Benchmark to all model type extensions

[patrickvonplaten]

This PR does the following changes:

1. • The default model class to benchmark is the one that can be found under config.architectures
2. • Improve plotting file

[codecov]

Codecov Report

Merging #5241 into master will increase coverage by 0.44%.
The diff coverage is 40.00%.

@@            Coverage Diff             @@
##           master    #5241      +/-   ##
==========================================
+ Coverage   77.49%   77.93%   +0.44%     
==========================================
  Files         138      138              
  Lines       23787    23806      +19     
==========================================
+ Hits        18433    18554     +121     
+ Misses       5354     5252     -102     

Impacted Files	Coverage Δ
src/transformers/benchmark/benchmark.py	74.01% <33.33%> (-5.12%)	⬇️
src/transformers/benchmark/benchmark_tf.py	79.81% <37.50%> (-2.88%)	⬇️
src/transformers/benchmark/benchmark_args_utils.py	89.36% <100.00%> (+0.23%)	⬆️
src/transformers/benchmark/benchmark_utils.py	69.84% <100.00%> (+0.07%)	⬆️
src/transformers/data/processors/squad.py	28.66% <0.00%> (-28.03%)	⬇️
src/transformers/modeling_tf_pytorch_utils.py	88.05% <0.00%> (-1.26%)	⬇️
src/transformers/tokenization_bert.py	90.45% <0.00%> (-0.83%)	⬇️
src/transformers/file_utils.py	76.42% <0.00%> (-0.39%)	⬇️
src/transformers/tokenization_utils.py	94.81% <0.00%> (-0.38%)	⬇️
src/transformers/modeling_tf_utils.py	86.00% <0.00%> (+0.29%)	⬆️
... and 1 more

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[patrickvonplaten]

Tagging @LysandreJik @julien-c for notification. Benchmarks are extended to use the model class as written in their config.architecture list.

Merging for now, I think this should be good.