Upgrade to latest LS protocol

[MikhailArkhipov]

Upgrade to latest LS protocol since we need new CompletionItem field

Also
Fixes #2113
Fixes #2000

[d3r3kk]

Looks like this might need some npm update...

[codecov]

Codecov Report

Merging #2144 into master will decrease coverage by 0.36%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2144      +/-   ##
==========================================
- Coverage   79.86%   79.49%   -0.37%     
==========================================
  Files         308      308              
  Lines       14176    14175       -1     
  Branches     2520     2520              
==========================================
- Hits        11321    11268      -53     
- Misses       2843     2895      +52     
  Partials       12       12

Flag	Coverage Δ
#MacOS	?
#Windows	?

Impacted Files	Coverage Δ
src/client/activation/languageServer.ts	26.13% <ø> (ø)	⬆️
src/client/activation/downloader.ts	25% <ø> (+0.28%)	⬆️
src/client/common/platform/registry.ts	40.42% <0%> (-51.07%)	⬇️
src/client/common/platform/pathUtils.ts	66.66% <0%> (-33.34%)	⬇️
src/client/common/utils.ts	51.51% <0%> (-21.22%)	⬇️
src/client/common/platform/serviceRegistry.ts	88.88% <0%> (-11.12%)	⬇️
src/client/common/platform/platformService.ts	84.21% <0%> (-5.27%)	⬇️
src/client/common/process/pythonProcess.ts	88.63% <0%> (-4.55%)	⬇️
src/client/interpreter/locators/index.ts	91.48% <0%> (-4.26%)	⬇️
src/client/refactor/proxy.ts	81.05% <0%> (-3.16%)	⬇️
... and 7 more

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[d3r3kk]

Completed the PR in #2164. Thanks Mikhail!