Enhanced override completion.

[kurobon-jp]

VScode implementation for OmniSharp/omnisharp-roslyn#1577

[dnfclas]

All CLA requirements met.

[codecov]

Codecov Report

Merging #3205 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #3205      +/-   ##
==========================================
+ Coverage   89.81%   89.82%   +<.01%     
==========================================
  Files          59       59              
  Lines        1591     1592       +1     
  Branches       89       89              
==========================================
+ Hits         1429     1430       +1     
  Misses        151      151              
  Partials       11       11

Flag	Coverage Δ
#integration	100% <ø> (?)
#unit	89.82% <100%> (ø)	⬆️

Impacted Files	Coverage Δ
src/omnisharp/protocol.ts	83.18% <100%> (+0.15%)	⬆️

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