Review feedback: Move DnsResolverOptions to parent namespace

Author: bart-vmware

src/Libraries/Microsoft.Extensions.ServiceDiscovery.Dns/Resolver/DnsResolverOptions.cs renamed to src/Libraries/Microsoft.Extensions.ServiceDiscovery.Dns/DnsResolverOptions.cs

@@ -3,7 +3,7 @@
 
 using System.Net;
 
-namespace Microsoft.Extensions.ServiceDiscovery.Dns.Resolver;
+namespace Microsoft.Extensions.ServiceDiscovery.Dns;
 
 /// <summary>
 /// Provides configuration options for DNS resolution, including server endpoints, retry attempts, and timeout settings.

src/Libraries/Microsoft.Extensions.ServiceDiscovery.Dns/DnsSrvServiceEndpointProviderOptions.cs

@@ -1,8 +1,6 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 
-using Microsoft.Extensions.ServiceDiscovery.Dns.Resolver;
-
 namespace Microsoft.Extensions.ServiceDiscovery.Dns;
 
 /// <summary>