Microsoft.CodeAnalysis.Razor.Remote.IRemoteSignatureHelpService.GetSignatureHelpAsync(Microsoft.CodeAnalysis.ExternalAccess.Razor.JsonSerializableRazorPinnedSolutionInfoWrapper, Microsoft.CodeAnalysis.ExternalAccess.Razor.JsonSerializableDocumentId, Roslyn.LanguageServer.Protocol.Position, System.Threading.CancellationToken)