Add training status condition during image processing

[shashaka]

I have added a training condition to prevent certain image processing steps from being applied during the inference phase.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 79.43262% with 29 lines in your changes missing coverage. Please review.

Project coverage is 81.97%. Comparing base (0d3ba37) to head (0f6e7e0).

Files with missing lines	Patch %	Lines
...s/preprocessing/image_preprocessing/random_crop.py	68.75%	5 Missing and 5 partials ⚠️
...eprocessing/image_preprocessing/random_rotation.py	0.00%	10 Missing ⚠️
.../preprocessing/image_preprocessing/solarization.py	62.50%	4 Missing and 2 partials ⚠️
...s/preprocessing/image_preprocessing/random_flip.py	93.33%	0 Missing and 1 partial ⚠️
...ocessing/image_preprocessing/random_translation.py	94.11%	0 Missing and 1 partial ⚠️
...s/preprocessing/image_preprocessing/random_zoom.py	96.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #20677      +/-   ##
==========================================
- Coverage   81.98%   81.97%   -0.02%     
==========================================
  Files         544      544              
  Lines       50738    50751      +13     
  Branches     7842     7851       +9     
==========================================
+ Hits        41599    41604       +5     
- Misses       7249     7252       +3     
- Partials     1890     1895       +5     

Flag	Coverage Δ
keras	81.81% <77.30%> (-0.02%)	⬇️
keras-jax	63.94% <73.04%> (-0.01%)	⬇️
keras-numpy	58.87% <68.79%> (-0.02%)	⬇️
keras-openvino	29.94% <2.83%> (-0.01%)	⬇️
keras-tensorflow	64.69% <68.79%> (-0.02%)	⬇️
keras-torch	63.79% <73.04%> (-0.01%)	⬇️

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[fchollet]

LGTM -- thank you!