Added ability to define the scheduler used for both input and output

[david-driscoll]

This gives use the ability to assign a specific scheduler for both the InputHandler and OutputHandler based on configuration. This should help in more scenarios (I'm looking at you Blazor).

cc @anthony-c-martin @NTaylorMullen

[codecov]

Codecov Report

Merging #458 (31a2ffb) into master (60ebb3a) will decrease coverage by 0.06%.
The diff coverage is 55.55%.

@@            Coverage Diff             @@
##           master     #458      +/-   ##
==========================================
- Coverage   71.44%   71.38%   -0.07%     
==========================================
  Files         251      251              
  Lines       11892    11905      +13     
  Branches      812      806       -6     
==========================================
+ Hits         8496     8498       +2     
- Misses       3396     3407      +11     

Impacted Files	Coverage Δ
src/JsonRpc/JsonRpcServerOptionsExtensions.cs	0.00% <0.00%> (ø)
src/JsonRpc/OutputHandler.cs	98.27% <ø> (-0.24%)	⬇️
...red/LanguageProtocolServiceCollectionExtensions.cs	94.44% <ø> (ø)
src/JsonRpc/Connection.cs	100.00% <100.00%> (ø)
src/JsonRpc/InputHandler.cs	88.05% <100.00%> (+0.02%)	⬆️
src/JsonRpc/JsonRpcServerOptionsBase.cs	78.20% <100.00%> (+0.57%)	⬆️
...sonRpc/JsonRpcServerServiceCollectionExtensions.cs	88.81% <100.00%> (+0.38%)	⬆️
src/Shared/LspRequestRouter.cs	100.00% <0.00%> (+1.96%)	⬆️

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