Enable code refactoring when using the new Analysis Engine

[DonJayamanne]

Fixes #1774

This pull request:

• Has a title summarizes what is changing
• Includes a news entry file (remember to thank yourself!)

[DonJayamanne]

@MikhailArkhipov @brettcannon
Ideally we should be including this into the current release.

[codecov]

Codecov Report

Merging #1801 into master will decrease coverage by 0.1%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master   #1801      +/-   ##
=========================================
- Coverage    74.1%     74%   -0.11%     
=========================================
  Files         282     282              
  Lines       13089   13090       +1     
  Branches     2335    2335              
=========================================
- Hits         9700    9687      -13     
- Misses       3259    3265       +6     
- Partials      130     138       +8

Impacted Files	Coverage Δ
src/client/extension.ts	97.05% <100%> (+0.08%)	⬆️
src/client/activation/classic.ts	91.3% <100%> (-0.54%)	⬇️
src/client/debugger/PythonProcess.ts	45.83% <0%> (-5.42%)	⬇️
...rc/client/debugger/PythonProcessCallbackHandler.ts	53.61% <0%> (-0.66%)	⬇️
src/client/debugger/Main.ts	51.85% <0%> (-0.5%)	⬇️
src/client/debugger/mainV2.ts	80.72% <0%> (+0.8%)	⬆️
src/client/linters/lintingEngine.ts	91.15% <0%> (+0.88%)	⬆️

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[MikhailArkhipov]

@DonJayamanne - yes please, this should be in May.