Add InlayHint implementation to OmniSharp.LSP #419

Job	Run time
Test (ubuntu-20.04, OmniSharp.MSBuild.Tests,OmniSharp.Roslyn.CSharp.Tests,OmniSharp.Cake.Tests,Om...	20m 26s
Test (ubuntu-20.04, OmniSharp.MSBuild.Tests,OmniSharp.Roslyn.CSharp.Tests,OmniSharp.Cake.Tests,Om...	20m 26s
Test (ubuntu-20.04, OmniSharp.DotNetTest.Tests)	14m 33s
Test (ubuntu-20.04, OmniSharp.DotNetTest.Tests)	14m 33s
Test (windows-2022, OmniSharp.MSBuild.Tests,OmniSharp.Roslyn.CSharp.Tests,OmniSharp.Cake.Tests,Om...	44m 7s
Test (windows-2022, OmniSharp.MSBuild.Tests,OmniSharp.Roslyn.CSharp.Tests,OmniSharp.Cake.Tests,Om...	47m 57s
Test (windows-2022, OmniSharp.DotNetTest.Tests)	21m 39s
Test (windows-2022, OmniSharp.DotNetTest.Tests)	21m 39s
Test (macos-11, OmniSharp.MSBuild.Tests,OmniSharp.Roslyn.CSharp.Tests,OmniSharp.Cake.Tests,OmniSh...	36m 3s
Test (macos-11, OmniSharp.MSBuild.Tests,OmniSharp.Roslyn.CSharp.Tests,OmniSharp.Cake.Tests,OmniSh...	36m 3s
Test (macos-11, OmniSharp.DotNetTest.Tests)	19m 10s
Test (macos-11, OmniSharp.DotNetTest.Tests)	19m 10s
	5h 15m 46s

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