add data augmentation to sanakoyeu_et_al_2018

[pmeier]

This adds the image augmentation pipeline that was split off from #162 (and later #177 ). For the augmentation transforms we pull kornia as dependency. Given that pystiche has already started to replace the custom transforms with kornia and it will be a dependency in the future anyway, this should be fine.

ToDo:

• [x] Tests

[codecov[bot]]

Codecov Report

Merging #183 into sanakoyeu-2018 will decrease coverage by 1.0%. The diff coverage is 89.4%.

@@               Coverage Diff                @@
##           sanakoyeu-2018    #183     +/-   ##
================================================
- Coverage            98.7%   97.6%   -1.1%     
================================================
  Files                  42      44      +2     
  Lines                1624    1897    +273     
================================================
+ Hits                 1603    1852    +249     
- Misses                 21      45     +24     

Impacted Files	Coverage Δ
...tiche_papers/sanakoyeu_et_al_2018/_augmentation.py	88.6% <88.6%> (ø)
pystiche_papers/sanakoyeu_et_al_2018/__init__.py	100.0% <100.0%> (ø)
pystiche_papers/sanakoyeu_et_al_2018/_data.py	100.0% <100.0%> (ø)
pystiche_papers/utils/misc.py	97.2% <100.0%> (+0.1%)	:arrow_up:
pystiche_papers/utils/modules.py	98.1% <100.0%> (-0.1%)	:arrow_down:
pystiche_papers/sanakoyeu_et_al_2018/_loss.py	100.0% <0.0%> (ø)
pystiche_papers/sanakoyeu_et_al_2018/_modules.py	94.5% <0.0%> (+0.6%)	:arrow_up:
pystiche_papers/johnson_alahi_li_2016/_modules.py	100.0% <0.0%> (+4.1%)	:arrow_up:

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