CIF-1330 - GraphQL endpoint used by client-side code should be configurable

[herzog31]

Description

• Added option to cloud configuration to set client-side Magento GraphQL endpoint
• Renamed StoreViewExporter to StoreConfigExporter and added Magento GraphQL endpoint as exported property.
• Updated React and JavaScript code to get GraphQL endpoint from the page model.

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.

[LSantha]

This is public API, some Javadoc would be nice.

[codecov]

Codecov Report

Merging #244 into master will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##             master     #244   +/-   ##
=========================================
  Coverage     61.29%   61.29%           
  Complexity      566      566           
=========================================
  Files           150      150           
  Lines          4557     4558    +1     
  Branches        758      757    -1     
=========================================
+ Hits           2793     2794    +1     
  Misses         1679     1679           
  Partials         85       85           

Flag	Coverage Δ	Complexity Δ
#jest	40.68% <ø> (ø)	0.00 <ø> (ø)
#karma	94.81% <100.00%> (-0.02%)	0.00 <0.00> (ø)
#unittests	85.74% <100.00%> (+0.01%)	566.00 <3.00> (ø)

Impacted Files	Coverage Δ	Complexity Δ
...1/storeconfigexporter/StoreConfigExporterImpl.java	100.00% <100.00%> (ø)	4.00 <3.00> (?)
...ore/cif/clientlibs/common/js/CommerceGraphqlApi.js	85.48% <100.00%> (-0.24%)	0.00 <0.00> (ø)

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