Update src/Workspaces/SharedUtilitiesAndExtensions/Workspace/CSharp/LanguageServices/CSharpTypeInferenceService.TypeInferrer.cs
Co-Authored-By: NSam Harwell <sam@tunnelvisionlabs.com>

* Add overload used by Razor via IVT back

* Update src/Workspaces/Core/Portable/Workspace/Solution/DocumentInfo.cs
Co-Authored-By: NJason Malinowski <jason.malinowski@microsoft.com>
Co-authored-by: NJason Malinowski <jason@jason-m.com>

Follow up to https://github.com/dotnet/roslyn/pull/42015/files#r385741503
This change allows couple of things:
1. Make C# and VB ISyntaxFactsService implementation private nested types.
2. Aid future porting of analyzers to CodeStyle layer by moving bunch of our analyzers/fixers/helpers to use ISyntaxFacts as opposed to ISyntaxFactsService, latter is not available in CodeStyle analyzer layer.

* Failing tests for writing with a range starting > 0

* Fixed SourceText.Write for spans that don't start at 0

* Math.Min is redundant with CheckSubSpan

* TextSpan guarantees that Start >= 0

* TextSpan guarantees that Start <= End

* Assert is preferred over comment

Move back the ContextQuery related extensions and corresponding SyntaxFact APIs up to the shared WorkspaceExtensions project