Updated to latest DAP spec

[david-driscoll]

DAP Updates

• This updates to the latest DAP spec, added in a few enums and replaced strings that were used in a few locations.
• Added InvalidatedEvent

Generators

Added a generator for the new [StringEnum] attribute that requires a public readonly partial struct and generates an all the pieces needed to make an enum that accepts custom string values.

[codecov]

Codecov Report

Merging #448 (439a520) into master (5f3a5ac) will increase coverage by 71.54%.
The diff coverage is 99.08%.

@@             Coverage Diff             @@
##           master     #448       +/-   ##
===========================================
+ Coverage        0   71.54%   +71.54%     
===========================================
  Files           0      251      +251     
  Lines           0    11908    +11908     
  Branches        0      813      +813     
===========================================
+ Hits            0     8520     +8520     
- Misses          0     3388     +3388     

Impacted Files	Coverage Δ
src/Dap.Client/DebugAdapterClientOptions.cs	16.66% <ø> (ø)
src/JsonRpc/Generation/StringEnumAttribute.cs	0.00% <0.00%> (ø)
src/JsonRpc/NoopResponseRouter.cs	0.00% <0.00%> (ø)
...erialization/Converters/EnumLikeStringConverter.cs	66.66% <ø> (ø)
src/JsonRpc.Generators/EnumLikeStringGenerator.cs	99.30% <99.30%> (ø)
src/JsonRpc.Generators/GeneratorDiagnostics.cs	100.00% <100.00%> (ø)
src/JsonRpc/Events.cs	100.00% <100.00%> (ø)
...t/DebugAdapterClientServiceCollectionExtensions.cs	96.59% <0.00%> (ø)
src/JsonRpc/ProcessScheduler.cs	100.00% <0.00%> (ø)
src/Server/Logging/LanguageServerLoggingManager.cs	85.18% <0.00%> (ø)
... and 248 more

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