Microsoft.CodeAnalysis.ExternalAccess.Copilot.RelatedDocuments.ICopilotRelatedDocumentsService.GetRelatedDocumentIdsAsync(Microsoft.CodeAnalysis.Document, System.Int32, System.Func<System.Collections.Immutable.ImmutableArray<Microsoft.CodeAnalysis.DocumentId>, System.Threading.CancellationToken, System.Threading.Tasks.ValueTask>, System.Threading.CancellationToken)