Fixed case where dynamic registration would fail if Register is called before Initialize

[david-driscoll]

Turns out there is a race condition anyway where supported capabilities aren't loaded yet, and wouldn't be detected.

[codecov]

Codecov Report

Merging #348 into master will increase coverage by 0.13%.
The diff coverage is 98.24%.

@@            Coverage Diff             @@
##           master     #348      +/-   ##
==========================================
+ Coverage   75.35%   75.48%   +0.13%     
==========================================
  Files         441      441              
  Lines       12742    12774      +32     
  Branches     1180     1179       -1     
==========================================
+ Hits         9602     9643      +41     
+ Misses       3140     3131       -9     

Impacted Files	Coverage Δ
src/Server/LanguageServerHelpers.cs	90.59% <98.07%> (+2.22%)	⬆️
src/Server/DefaultLanguageServerFacade.cs	82.35% <100.00%> (+0.53%)	⬆️
src/Server/LanguageServer.cs	96.47% <100.00%> (ø)
src/Protocol/Models/UnregistrationContainer.cs	46.66% <0.00%> (ø)
src/Protocol/Models/RegistrationContainer.cs	66.66% <0.00%> (+8.33%)	⬆️
src/Testing/ClientCapabilityExtensions.cs	100.00% <0.00%> (+64.28%)	⬆️

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