Add general swagger/openApi SDK

[easingthemes]

Description

1. openApi SDK: creating dynamic methods based on openApi spec file
2. CustomerProfile SDK: extending openApi SDK and adding custom methods
3. Tools added for fetching latest API spec and converting from swagger to openApi

Related Issue

Initial SDK

Motivation and Context

Initial SDK

How Has This Been Tested?

Tested in active project

Screenshots (if appropriate):

Types of changes

Initial SDK v1.0.0

Checklist:

• I have signed the Adobe Open Source CLA.
• My code follows the code style of this project.
• 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. *
• All new and existing tests passed. *

[codecov]

Codecov Report

Merging #3 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master     #3   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           3      4    +1     
  Lines          63    112   +49     
  Branches        7     15    +8     
=====================================
+ Hits           63    112   +49

Impacted Files	Coverage Δ
src/helpers.js	100% <ø> (ø)	⬆️
src/openApiSDK.js	100% <100%> (ø)
src/index.js	100% <100%> (ø)	⬆️
src/SDKErrors.js	100% <100%> (ø)	⬆️

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[shazron]

Thanks for this huge contribution! Just some minor changes requested.