Add InlayHint implementation to OmniSharp.LSP #415

Job	Run time
Test (ubuntu-20.04, OmniSharp.MSBuild.Tests,OmniSharp.Roslyn.CSharp.Tests,OmniSharp.Cake.Tests,Om...	26m 18s
Test (ubuntu-20.04, OmniSharp.MSBuild.Tests,OmniSharp.Roslyn.CSharp.Tests,OmniSharp.Cake.Tests,Om...	26m 18s
Test (ubuntu-20.04, OmniSharp.DotNetTest.Tests)	15m 43s
Test (ubuntu-20.04, OmniSharp.DotNetTest.Tests)	15m 43s
Test (windows-2022, OmniSharp.MSBuild.Tests,OmniSharp.Roslyn.CSharp.Tests,OmniSharp.Cake.Tests,Om...	47m 19s
Test (windows-2022, OmniSharp.MSBuild.Tests,OmniSharp.Roslyn.CSharp.Tests,OmniSharp.Cake.Tests,Om...	47m 19s
Test (windows-2022, OmniSharp.DotNetTest.Tests)	23m 32s
Test (windows-2022, OmniSharp.DotNetTest.Tests)	23m 32s
Test (macos-11, OmniSharp.MSBuild.Tests,OmniSharp.Roslyn.CSharp.Tests,OmniSharp.Cake.Tests,OmniSh...	41m 16s
Test (macos-11, OmniSharp.MSBuild.Tests,OmniSharp.Roslyn.CSharp.Tests,OmniSharp.Cake.Tests,OmniSh...	40m 9s
Test (macos-11, OmniSharp.DotNetTest.Tests)	22m 10s
Test (macos-11, OmniSharp.DotNetTest.Tests)	22m 10s
	5h 51m 29s

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