CIF-2895 - Add example for product filter hook

[herzog31]

Description

• Added example of how to extend the product filter via retriever in MyProductTeaser. The added filter does not have any impact when using the Venia product catalog.

Requires a release of adobe/commerce-cif-magento-graphql#29 before it can be merged.

Related Issue

See

• CIF-2895 - Extend ProductAttributeFilterInput with custom filters commerce-cif-magento-graphql#27
• CIF-2895 - Extend product retriever with hook for product filters aem-core-cif-components#938

How Has This Been Tested?

Manually tested.

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]

Codecov Report

Merging #300 (c8d66ba) into dev (d2e3d1d) will decrease coverage by 9.95%.
The diff coverage is 0.00%.

❗ Current head c8d66ba differs from pull request most recent head c885f2d. Consider uploading reports for the commit c885f2d to get more accurate results

@@             Coverage Diff              @@
##                dev     #300      +/-   ##
============================================
- Coverage     87.09%   77.14%   -9.96%     
  Complexity       21       21              
============================================
  Files             1        1              
  Lines            31       35       +4     
  Branches          4        4              
============================================
  Hits             27       27              
- Misses            2        6       +4     
  Partials          2        2              

Flag	Coverage Δ
unittests	77.14% <0.00%> (-9.96%)	⬇️

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

Impacted Files	Coverage Δ
...enia/core/models/commerce/MyProductTeaserImpl.java	77.14% <0.00%> (-9.96%)	⬇️

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