Set next statement support

[gregg-miskelly]

This adds a new command to the C# extension to invoke the 'set next statement' protocol messages.

This fixes #1753

[codecov]

Codecov Report

Merging #2775 into master will decrease coverage by 0.42%.
The diff coverage is 47.61%.

@@            Coverage Diff             @@
##           master    #2775      +/-   ##
==========================================
- Coverage   65.51%   65.09%   -0.43%     
==========================================
  Files         102      104       +2     
  Lines        4443     4506      +63     
  Branches      641      654      +13     
==========================================
+ Hits         2911     2933      +22     
- Misses       1348     1388      +40     
- Partials      184      185       +1

Flag	Coverage Δ
#integration	52.36% <9.52%> (-0.8%)	⬇️
#unit	85.56% <100%> (+0.22%)	⬆️

Impacted Files	Coverage Δ
src/coreclr-debug/setNextStatementHelpers.ts	100% <100%> (ø)
src/features/commands.ts	36.17% <100%> (+1.38%)	⬆️
src/coreclr-debug/setNextStatement.ts	8.33% <8.33%> (ø)
src/features/documentation.ts	38.09% <0%> (-9.53%)	⬇️
src/features/completionItemProvider.ts	77.94% <0%> (-8.83%)	⬇️
src/features/diagnosticsProvider.ts	77.92% <0%> (+1.29%)	⬆️

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