Enable Plugin Install Flow For VS Code

[edzkite]

Spec

• Add check to see if Kite has been installed / run in the past
• Add option launchCopilot that can be passed by the plugin. Setting this to true will open the Copilot after installation
• Enable channel to be set and sent by the plugin for metrics
• Linux
  • Always read from the child stdout stream. This enables the download to proceed even without a progress callback.
• OSX
  • Add codesign --force --deep -sign - /Applications/Kite.app into the installation flow. This is needed to be able to launch Kite properly on macOS Big Sur.

[codecov-io]

Codecov Report

Merging #44 (b0185f9) into master (d845183) will decrease coverage by 0.77%. The diff coverage is 71.42%.

@@            Coverage Diff             @@
##           master      #44      +/-   ##
==========================================
- Coverage   73.59%   72.81%   -0.78%     
==========================================
  Files          17       17              
  Lines         727      743      +16     
==========================================
+ Hits          535      541       +6     
- Misses        192      202      +10     

Impacted Files	Coverage Δ
lib/support/no-support.js	96.42% <0.00%> (-3.58%)	:arrow_down:
lib/support/test-adapter.js	96.55% <0.00%> (-3.45%)	:arrow_down:
lib/support/linux.js	59.50% <68.29%> (-0.33%)	:arrow_down:
lib/support/windows.js	64.94% <68.96%> (-1.72%)	:arrow_down:
lib/support/osx.js	77.41% <79.48%> (-2.13%)	:arrow_down:
lib/index.js	75.32% <100.00%> (+0.32%)	:arrow_up:

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