Refactor data providers and update abstractions

- Removed obsolete data providers: `AnchorCollectionDataProvider`, `ContentsDataProvider`, and others, consolidating logic into new composable providers.
- Added `ComposeDataProviders`, `SelectDataProvider`, and `RelationalDataProvider` for improved flexibility and reusability.
- Introduced `IManySelectionComposableDataProvider` interface to support multiple-node selection.
- Enhanced `UnitDownloader` with more robust progress tracking.
- Updated package references and project dependencies for consistency.
- Improved error handling in `StealthConfig` initialization for better fallback on browser drivers.
- Incremented project version to 2.4.5.

Beam.Api/ApiCallBuilder.cs

@@ -2,11 +2,12 @@
 using System.Collections.Generic;
 using System.Linq;
 using System.Net;
+using System.Net.Http;
 using System.Reflection.PortableExecutable;
 using System.Text;
 using System.Threading.Tasks;
 
-namespace Beam {
+namespace Beam.Api;
     public class ApiCallBuilder(HttpClient client) {
         HttpClient Client = client;
         string Uri;
@@ -77,4 +78,4 @@ namespace Beam {
             return new ApiCall(Client, Uri, Method, Headers.Select((x) => new KeyValuePair<string, string[]>(x.Key, x.Value.ToArray())).ToArray(), Data, Body, SuccessCodes);
         }
     }
-}
+