feat: Refactor WeaviateClient to remove token service factory and streamline async initialization

Author: mpartipilo

src/Weaviate.Client/DependencyInjection/WeaviateClientFactory.cs

@@ -70,7 +70,7 @@ private async Task<WeaviateClient> CreateClientAsync(string name)
         var logger = _loggerFactory.CreateLogger<WeaviateClient>();
 
         var clientOptions = Options.Create(options);
-        var client = new WeaviateClient(clientOptions, null, logger);
+        var client = new WeaviateClient(clientOptions, logger);
 
         // Initialize the client
         await client.InitializeAsync();

src/Weaviate.Client/WeaviateClient.cs

@@ -21,7 +21,6 @@ public partial class WeaviateClient : IDisposable
 
     // Async initialization support
     private readonly Lazy<Task>? _initializationTask;
-    private readonly ITokenServiceFactory? _tokenServiceFactory;
     private readonly ClientConfiguration? _configForAsyncInit;
 
     public async Task<Models.MetaInfo> GetMeta(CancellationToken cancellationToken = default)