interpreting server_mode field (to support Valkey 8+ cluster)

src/StackExchange.Redis/AutoConfigureInfoField.cs

@@ -37,6 +37,9 @@ internal enum AutoConfigureInfoField
 
     [AsciiHash("valkey_version")]
     ValkeyVersion,
+
+    [AsciiHash("server_mode")]
+    ServerMode,
 }
 
 /// <summary>

src/StackExchange.Redis/ResultProcessor.cs

@@ -920,6 +920,7 @@ protected override bool SetResultCore(PhysicalConnection connection, Message mes
                                             }
                                             break;
                                         case AutoConfigureInfoField.RedisMode:
+                                        case AutoConfigureInfoField.ServerMode:
                                             if (ServerTypeMetadata.TryParse(valSpan, out var serverType))
                                             {
                                                 server.ServerType = serverType;

tests/StackExchange.Redis.Tests/AutoConfigureInfoFieldUnitTests.cs

@@ -14,6 +14,7 @@ public class AutoConfigureInfoFieldUnitTests
     [InlineData("run_id", (int)AutoConfigureInfoField.RunId)]
     [InlineData("garnet_version", (int)AutoConfigureInfoField.GarnetVersion)]
     [InlineData("valkey_version", (int)AutoConfigureInfoField.ValkeyVersion)]
+    [InlineData("server_mode", (int)AutoConfigureInfoField.ServerMode)]
     public void TryParse_CharSpan_KnownFields(string value, int expected)
     {
         Assert.True(AutoConfigureInfoFieldMetadata.TryParse(value.AsSpan(), out var actual));