CIF-2107 - Add Magento Storefront Events SDK

[herzog31]

Description

• Added new core.cif.components.storefront-events.v1 clientlib which embeds the @adobe/magento-storefront-events-sdk npm package and exposes it globally at window.magentoStorefrontEvents, so it can be used by both the server-side and client-side components.
• Added some foundation for client-side React components to use the Magento Storefront Events SDK.
• This PR serves as base for all following subtasks of CIF-2107, so do not merge yet.

How Has This Been Tested?

Screenshots (if appropriate):

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 #579 (02f2672) into master (313268d) will increase coverage by 0.66%.
The diff coverage is 95.77%.

@@             Coverage Diff              @@
##             master     #579      +/-   ##
============================================
+ Coverage     87.24%   87.90%   +0.66%     
- Complexity     1333     1363      +30     
============================================
  Files           238      249      +11     
  Lines          6219     6410     +191     
  Branches        927      961      +34     
============================================
+ Hits           5426     5635     +209     
+ Misses          597      580      -17     
+ Partials        196      195       -1     

Flag	Coverage Δ
integration	64.29% <82.69%> (+0.27%)	⬆️
jest	85.34% <96.27%> (+1.85%)	⬆️
karma	94.82% <ø> (ø)
unittests	87.09% <94.23%> (+0.16%)	⬆️

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

Impacted Files	Coverage Δ
react-components/src/components/App/app.js	12.50% <0.00%> (-7.50%)	⬇️
react-components/src/components/AuthBar/authBar.js	91.66% <ø> (-2.46%)	⬇️
...act-components/src/components/Checkout/overview.js	9.52% <0.00%> (+1.83%)	⬆️
react-components/src/utils/test-utils.js	68.42% <ø> (ø)
...rontcontext/AbstractCommerceStorefrontContext.java	50.00% <50.00%> (ø)
react-components/src/utils/usePageEvent.js	95.00% <95.00%> (ø)
react-components/src/utils/dataLayerUtils.js	96.66% <96.55%> (-0.21%)	⬇️
...onents/internal/models/v1/product/ProductImpl.java	90.47% <100.00%> (+0.06%)	⬆️
...ernal/models/v1/productlist/CategoryRetriever.java	100.00% <100.00%> (ø)
...nternal/models/v1/productlist/ProductListImpl.java	94.80% <100.00%> (+0.06%)	⬆️
... and 34 more

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