CIF-2519 - Support category filter for product list component

[LSantha]

• added support for manual category selection in edit dialog and model
• added unit tests
• added sample page in examples project for manual category selection
• added integration test

Related Issue

CIF-2519

How Has This Been Tested?

Manual, unit test, integration test, UI test.

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.
• [X] 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 #821 (7a3ae7a) into master (204fe13) will increase coverage by 0.00%. The diff coverage is 100.00%.

@@            Coverage Diff            @@
##             master     #821   +/-   ##
=========================================
  Coverage     89.42%   89.42%           
- Complexity     1871     1872    +1     
=========================================
  Files           316      316           
  Lines          8322     8323    +1     
  Branches       1253     1254    +1     
=========================================
+ Hits           7442     7443    +1     
  Misses          629      629           
  Partials        251      251           

Flag	Coverage Δ
integration	54.94% <100.00%> (+<0.01%)	:arrow_up:
jest	86.40% <ø> (ø)
karma	94.83% <ø> (ø)
unittests	88.85% <100.00%> (+<0.01%)	:arrow_up:

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

Impacted Files	Coverage Δ
...nternal/models/v1/productlist/ProductListImpl.java	89.88% <100.00%> (+0.11%)	:arrow_up:

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