CIF-2736 - Support custom sort keys in product listing components

[LSantha]

• extended productcollection edit dialog with configuration for default sorting
• implemented support for default sorting configuration in productlist and searchresults components
• updated unit tests

Related Issue

CIF-2736

How Has This Been Tested?

Manually, unit tests.

Screenshots (if appropriate):

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [X] 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.
• [X] My change requires a change to the documentation.
• [X] I have updated the documentation accordingly.
• [ ] I have read the CONTRIBUTING document.
• [X] I have added tests to cover my changes and the overall coverage did not decrease.
• [X] All unit tests pass on CircleCi.
• [X] I ran all tests locally and they pass.

[codecov[bot]]

Codecov Report

Merging #901 (3c7b441) into master (54be0f0) will decrease coverage by 0.70%. The diff coverage is 17.70%.

@@             Coverage Diff              @@
##             master     #901      +/-   ##
============================================
- Coverage     69.22%   68.52%   -0.71%     
  Complexity     1165     1165              
============================================
  Files           323      325       +2     
  Lines          8559     8622      +63     
  Branches       1278     1288      +10     
============================================
- Hits           5925     5908      -17     
- Misses         2220     2302      +82     
+ Partials        414      412       -2     

Flag	Coverage Δ
integration	53.66% <17.70%> (-1.01%)	:arrow_down:
jest	86.38% <ø> (ø)
karma	95.17% <ø> (ø)
unittests	90.86% <ø> (ø)

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

Impacted Files	Coverage Δ
...ts/models/productcollection/ProductCollection.java	0.00% <ø> (ø)
.../cq/commerce/core/search/models/SearchOptions.java	0.00% <0.00%> (ø)
...m/adobe/cq/commerce/core/search/models/Sorter.java	33.33% <0.00%> (-66.67%)	:arrow_down:
...l/servlets/ProductSortFieldsDataSourceServlet.java	3.44% <3.44%> (ø)
...ch/internal/services/SearchResultsServiceImpl.java	59.14% <21.73%> (-11.50%)	:arrow_down:
...core/search/internal/models/SearchOptionsImpl.java	86.27% <33.33%> (-7.06%)	:arrow_down:
...nternal/models/v1/productlist/ProductListImpl.java	79.34% <40.00%> (-2.68%)	:arrow_down:
...nal/models/v1/searchresults/SearchResultsImpl.java	90.00% <40.00%> (-10.00%)	:arrow_down:
...mmerce/core/search/internal/models/SorterImpl.java	71.42% <0.00%> (-28.58%)	:arrow_down:
... and 3 more

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