Change implementation to Feign to align with AIO Lilb

[bstopp]

Description

Removed the swagger API implementation and swapped it for Feign. This allows using the upstream API and creates consistency.

Also adding (some) missing APIs

Related Issue

39

Motivation and Context

See above.

How Has This Been Tested?

Re-implemented every previous existing test case. Added new tests for all new APIs.

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [x] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [x] I have signed the Adobe Open Source CLA.
• [x] My code follows the code style of this project.
• [x] My change requires a change to the documentation.
• [x] I have updated the documentation accordingly.
• [x] I have read the CONTRIBUTING document.
• [x] I have added tests to cover my changes.
• [x] All new and existing tests passed.

[codecov[bot]]

Codecov Report

Merging #76 (e3149cf) into main (d242e6b) will decrease coverage by 0.39%. Report is 3 commits behind head on main. The diff coverage is 91.38%.

@@             Coverage Diff              @@
##               main      #76      +/-   ##
============================================
- Coverage     91.92%   91.53%   -0.39%     
- Complexity      212      426     +214     
============================================
  Files            22       52      +30     
  Lines           755     1110     +355     
  Branches         64       94      +30     
============================================
+ Hits            694     1016     +322     
- Misses           42       63      +21     
- Partials         19       31      +12     

Flag	Coverage Δ
unittests	91.53% <91.38%> (-0.39%)	:arrow_down:

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

Files	Coverage Δ
...o/adobe/cloudmanager/CloudManagerApiException.java	100.00% <100.00%> (+8.49%)	:arrow_up:
...c/main/java/io/adobe/cloudmanager/ContentFlow.java	100.00% <100.00%> (ø)
src/main/java/io/adobe/cloudmanager/Pipeline.java	100.00% <100.00%> (ø)
.../java/io/adobe/cloudmanager/PipelineExecution.java	100.00% <100.00%> (ø)
...adobe/cloudmanager/PipelineExecutionStepState.java	100.00% <100.00%> (ø)
...rc/main/java/io/adobe/cloudmanager/StepAction.java	100.00% <ø> (ø)
...udmanager/exception/DeleteInProgressException.java	100.00% <100.00%> (ø)
...oudmanager/exception/PipelineRunningException.java	100.00% <100.00%> (ø)
...ain/java/io/adobe/cloudmanager/impl/FeignUtil.java	100.00% <100.00%> (ø)
.../java/io/adobe/cloudmanager/impl/VariableImpl.java	100.00% <100.00%> (ø)
... and 42 more

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