Fix runtime review findings

clients/dotnet/MxGateway.Client/GalaxyRepositoryClient.cs

@@ -18,6 +18,8 @@ namespace MxGateway.Client;
 /// </summary>
 public sealed class GalaxyRepositoryClient : IAsyncDisposable
 {
+    private const int DiscoverHierarchyPageSize = 5000;
+
     private readonly GrpcChannel? _channel;
     private readonly IGalaxyRepositoryClientTransport _transport;
     private readonly ResiliencePipeline _safeUnaryRetryPipeline;
@@ -68,6 +70,8 @@ public sealed class GalaxyRepositoryClient : IAsyncDisposable
             {
                 HttpHandler = handler,
                 LoggerFactory = options.LoggerFactory,
+                MaxReceiveMessageSize = options.MaxGrpcMessageBytes,
+                MaxSendMessageSize = options.MaxGrpcMessageBytes,
             });
 
         return new GalaxyRepositoryClient(
@@ -141,12 +145,25 @@ public sealed class GalaxyRepositoryClient : IAsyncDisposable
     /// </summary>
     public async Task<IReadOnlyList<GalaxyObject>> DiscoverHierarchyAsync(CancellationToken cancellationToken = default)
     {
-        DiscoverHierarchyReply reply = await DiscoverHierarchyRawAsync(
-                new DiscoverHierarchyRequest(),
-                cancellationToken)
-            .ConfigureAwait(false);
+        List<GalaxyObject> objects = [];
+        string pageToken = string.Empty;
+        do
+        {
+            DiscoverHierarchyReply reply = await DiscoverHierarchyRawAsync(
+                    new DiscoverHierarchyRequest
+                    {
+                        PageSize = DiscoverHierarchyPageSize,
+                        PageToken = pageToken,
+                    },
+                    cancellationToken)
+                .ConfigureAwait(false);
 
-        return reply.Objects;
+            objects.AddRange(reply.Objects);
+            pageToken = reply.NextPageToken;
+        }
+        while (!string.IsNullOrWhiteSpace(pageToken));
+
+        return objects;
     }
 
     public Task<DiscoverHierarchyReply> DiscoverHierarchyRawAsync(