CIF-1287 - Filling the category cache is slow

[LSantha]

• removed preloading all categories in the cache and implemented category loading and caching on demand, as it is requested by client calls
• performed performance related adjustments for XXL catalogs
• updated unit tests

Related Issue

CIF-1287

Motivation and Context

To achieve better performance and scalability for XXL catalogs.

How Has This Been Tested?

Manually testing + JUnit.

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.
• [ ] My change requires a change to the documentation.
• [ ] 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 #114 into master will increase coverage by 0.38%. The diff coverage is 91.56%.

@@             Coverage Diff              @@
##             master     #114      +/-   ##
============================================
+ Coverage     87.65%   88.04%   +0.38%     
+ Complexity      460      448      -12     
============================================
  Files            34       34              
  Lines          1823     1782      -41     
  Branches        277      274       -3     
============================================
- Hits           1598     1569      -29     
+ Misses           99       88      -11     
+ Partials        126      125       -1     

Flag	Coverage Δ	Complexity Δ
#integration	51.68% <68.67%> (+1.80%)	249.00 <15.00> (ø)
#karma	96.02% <ø> (+3.31%)	0.00 <ø> (ø)
#unittests	83.93% <87.95%> (+0.02%)	432.00 <19.00> (-12.00)	:arrow_up:

Impacted Files	Coverage Δ	Complexity Δ
...mmerce/graphql/magento/GraphqlDataServiceImpl.java	92.73% <89.28%> (-1.75%)	64.00 <16.00> (+6.00)	:arrow_down:
...e/cq/commerce/graphql/resource/ResourceMapper.java	74.07% <93.33%> (-5.19%)	22.00 <1.00> (-18.00)
...be/cq/commerce/graphql/magento/GraphqlQueries.java	98.03% <100.00%> (+0.03%)	18.00 <1.00> (ø)
...cq/commerce/graphql/resource/CategoryResource.java	92.85% <100.00%> (+1.19%)	9.00 <0.00> (-1.00)	:arrow_up:
...erce/graphql/resource/GraphqlResourceProvider.java	88.23% <100.00%> (ø)	12.00 <1.00> (ø)
...aphql/resource/GraphqlResourceProviderFactory.java	97.95% <100.00%> (ø)	12.00 <0.00> (ø)
...mnisearch/ProductsSuggestionOmniSearchHandler.java	89.88% <0.00%> (+1.12%)	14.00% <0.00%> (+1.00%)
...omponents/common/cifpicker/clientlibs/cifpicker.js	91.11% <0.00%> (+11.11%)	0.00% <0.00%> (ø%)

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