feat: add proxy support

[shazron]

Fixes #83

Dependencies

• Depends on release of feat: add proxy support aio-lib-core-networking#14
• Update version of https://github.com/adobe/aio-lib-core-networking dependency in package.json to final released version

Dependents (update references in the PRs when this is merged in to master)

• feat: add proxy support aio-cli-plugin-app#480
• rename @adobe/generator-aio-console to @adobe/aio-cli-lib-console aio-cli-plugin-console#167
• feat: add proxy support (via ims lib) aio-cli-plugin-auth#59

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

Merging #85 (49322d1) into master (a714a7a) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master       #85   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            8         8           
  Lines          420       421    +1     
  Branches        51        51           
=========================================
+ Hits           420       421    +1     

Impacted Files	Coverage Δ
src/ims.js	100.00% <100.00%> (ø)

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[moritzraho]

lgtm