Added the ability to use strongly typed data fields with codelens, completion and documentlink

[david-driscoll]

This enables multiple handlers to be registered for a given document selector for Code Lens, Completion and Document Link.

• This can be used to have a code lens provider for unit tests, and a different one for references (as an example).
• the resolved data must now be an object to ensure that we can route the data properly.
• This includes a few minor breaking changes.
  • CanResolve has been removed since the built in routing will ensure that the handler that created the codelens/completion/documentlink is the one that is called to resolve.
  • The internals have been changed to return multiple descriptors instead of a single one.

+semver:minor.

[codecov]

Codecov Report

Merging #269 into master will increase coverage by 2.15%.
The diff coverage is 71.18%.

@@            Coverage Diff             @@
##           master     #269      +/-   ##
==========================================
+ Coverage   61.60%   63.75%   +2.15%     
==========================================
  Files         352      356       +4     
  Lines       10461    11418     +957     
  Branches     1208     1315     +107     
==========================================
+ Hits         6444     7280     +836     
- Misses       3639     3701      +62     
- Partials      378      437      +59     

Impacted Files	Coverage Δ
src/JsonRpc/Client/OutgoingResponse.cs	54.54% <ø> (ø)
src/Protocol/AbstractHandlers.cs	22.00% <ø> (+22.00%)	⬆️
src/Protocol/Document/ITextDocumentSyncHandler.cs	0.00% <ø> (ø)
src/Protocol/Workspace/IExecuteCommandHandler.cs	95.00% <0.00%> (+0.83%)	⬆️
src/Shared/SupportedCapabilities.cs	86.11% <0.00%> (+33.33%)	⬆️
src/Protocol/Models/CompletionList.cs	24.19% <11.76%> (-11.53%)	⬇️
src/Protocol/Models/CodeLensContainer.cs	35.71% <25.00%> (-14.29%)	⬇️
src/Protocol/Models/DocumentLinkContainer.cs	35.71% <25.00%> (+35.71%)	⬆️
src/Protocol/DelegatingHandlers.cs	31.84% <28.84%> (+3.47%)	⬆️
src/Server/Pipelines/ResolveCommandPipeline.cs	88.00% <33.33%> (-4.31%)	⬇️
... and 38 more

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