Added warning message when a message is dropped during initialization

[david-driscoll]

Both DAP and LSP define a set of messages that are "allowed during" the initialization hand shake. Today those messages are dropped behind the scenes, this set of changes will add some logs to let users know.

In addition for outgoing requests or notifications we will send them once initialization completes.

[codecov]

Codecov Report

Merging #417 (897203b) into master (a08ad10) will decrease coverage by 0.00%.
The diff coverage is 72.45%.

@@            Coverage Diff             @@
##           master     #417      +/-   ##
==========================================
- Coverage   72.97%   72.96%   -0.01%     
==========================================
  Files         576      582       +6     
  Lines       14205    14301      +96     
  Branches     1367     1371       +4     
==========================================
+ Hits        10366    10435      +69     
- Misses       3839     3866      +27     

Impacted Files	Coverage Δ
src/Client/LanguageClient.cs	97.22% <ø> (ø)
src/Dap.Client/DebugAdapterClient.cs	100.00% <ø> (ø)
src/Dap.Server/DebugAdapterServer.cs	100.00% <ø> (ø)
test/TestingUtils/AutoNSubstitute/TestLogger.cs	6.25% <6.25%> (ø)
src/Server/LspServerReceiver.cs	64.00% <35.71%> (-13.15%)	⬇️
src/Client/LspClientReceiver.cs	75.00% <53.84%> (-16.90%)	⬇️
...sonRpc/JsonRpcServerServiceCollectionExtensions.cs	88.43% <66.66%> (-0.38%)	⬇️
src/Server/LspServerOutputFilter.cs	72.72% <72.72%> (ø)
.../TestingUtils/AutoNSubstitute/TestLoggerFactory.cs	92.68% <75.00%> (-4.10%)	⬇️
src/Client/LspClientOutputFilter.cs	76.47% <76.47%> (ø)
... and 22 more

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