[ENH]Add Image Processing Folder, include shrinking functions which is content-aware image processing.

[FrancieNagiki]

Description

Add Image Processing Folder, include shrinking functions which is content-aware image processing. Including test cases and examples.

Type of Change

• New feature (non-breaking change which adds functionality)

Checklist

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[codecov-commenter]

Codecov Report

Merging #487 (b294bd1) into master (7a9da85) will increase coverage by 0.22%.
The diff coverage is 93.91%.

❗ Current head b294bd1 differs from pull request most recent head 5470477. Consider uploading reports for the commit 5470477 to get more accurate results

@@            Coverage Diff             @@
##           master     #487      +/-   ##
==========================================
+ Coverage   93.83%   94.05%   +0.22%     
==========================================
  Files          90       99       +9     
  Lines        7782     9073    +1291     
==========================================
+ Hits         7302     8534    +1232     
- Misses        480      539      +59     

Flag	Coverage Δ
unittests	94.05% <93.91%> (+0.22%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pulse2percept/datasets/nanduri2012.py	86.20% <ø> (ø)
pulse2percept/model_selection/optimizers.py	85.71% <0.00%> (+0.57%)	⬆️
pulse2percept/models/setup.py	0.00% <0.00%> (ø)
pulse2percept/processing/setup.py	0.00% <0.00%> (ø)
pulse2percept/setup.py	0.00% <0.00%> (ø)
pulse2percept/stimuli/__init__.py	100.00% <ø> (ø)
pulse2percept/datasets/beyeler2019.py	22.97% <50.00%> (ø)
pulse2percept/utils/parallel.py	87.50% <61.53%> (-6.84%)	⬇️
pulse2percept/models/base.py	87.32% <80.00%> (-0.04%)	⬇️
pulse2percept/utils/optimize.py	92.59% <80.00%> (ø)
... and 62 more

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[mbeyeler]

TODO MB:

• Fix naming, refactor, simplify
• Fix edge cases
• Speed up Cython
• Add comments & ref
• Update example