CIF-899 - Display category image on generic category page

[herzog31]

Description

Currently, Venia uses a feature in their store front that display a category image on the category page. By implementing this feature in our AEM Venia store front, we can make our store front visually more appealing.

• Because of API changes in the sling model, I bumped the current snapshot version to 2.0.
• Added image to product list component. Will only be displayed when showImage property from the design dialog is true and the category has an actual image.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have signed the Adobe Open Source CLA.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes and the overall coverage did not decrease.
• All unit tests pass on CircleCi.
• I ran all tests locally and they pass.

[codecov-io]

Codecov Report

Merging #68 into master will decrease coverage by 0.46%.
The diff coverage is 23.07%.

@@             Coverage Diff              @@
##             master      #68      +/-   ##
============================================
- Coverage     63.61%   63.15%   -0.47%     
- Complexity      166      168       +2     
============================================
  Files            28       28              
  Lines           984      996      +12     
  Branches         64       64              
============================================
+ Hits            626      629       +3     
- Misses          329      338       +9     
  Partials         29       29

Flag	Coverage Δ	Complexity Δ
#karma	94.39% <ø> (ø)	0 <ø> (ø)	⬇️
#unittests	53.66% <23.07%> (-0.46%)	168 <2> (+2)

Impacted Files	Coverage Δ	Complexity Δ
...ore/components/models/productlist/ProductList.java	0% <0%> (ø)	0 <0> (ø)	⬇️
...nternal/models/v1/productlist/ProductListImpl.java	30.76% <27.27%> (-0.09%)	16 <2> (+2)

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