feat: Proxy support

[sandeep-paliwal]

Swagger client was not using the set proxy.
Added option to use networking lib proxyFetch when proxy is set.

Description

Related Issue

adobe/aio-cli-plugin-console#218

Motivation and Context

How Has This Been Tested?

Manual Proxy setup and test
unit tests

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 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

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (601a3b4) to head (9cea668).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master       #85   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            3         3           
  Lines          530       533    +3     
  Branches        15        15           
=========================================
+ Hits           530       533    +3     

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