Added omnisharp.enableMsBuildLoadProjectsOnDemand

[dmgonch]

The new setting is to allow enabling feature OmniSharp/omnisharp-roslyn#1316
PR: OmniSharp/omnisharp-roslyn#1322

[codecov]

Codecov Report

Merging #2750 into master will decrease coverage by 0.19%.
The diff coverage is 50%.

@@           Coverage Diff            @@
##           master   #2750     +/-   ##
========================================
- Coverage    65.1%   64.9%   -0.2%     
========================================
  Files         101     101             
  Lines        4396    4400      +4     
  Branches      635     634      -1     
========================================
- Hits         2862    2856      -6     
- Misses       1351    1356      +5     
- Partials      183     188      +5

Flag	Coverage Δ
#integration	53.03% <50%> (-0.19%)	⬇️
#unit	85.12% <100%> (+0.01%)	⬆️

Impacted Files	Coverage Δ
src/observers/OptionChangeObserver.ts	100% <ø> (ø)	⬆️
src/omnisharp/server.ts	69.83% <0%> (-0.14%)	⬇️
src/omnisharp/options.ts	100% <100%> (ø)	⬆️
src/omnisharp/delayTracker.ts	68.42% <0%> (-5.27%)	⬇️
src/omnisharp/requestQueue.ts	75.75% <0%> (-4.55%)	⬇️
src/features/diagnosticsProvider.ts	77.92% <0%> (-2.6%)	⬇️

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[rchande]

LGTM modulo copyediting

[rchande]

@akshita31 Care to sign off here?

[rchande]

@dmgonch I created the release https://github.com/OmniSharp/omnisharp-vscode/releases/tag/v1.18.0-beta3 that you can install (in addition to enabled using latest omnisharp) to try this out.