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.Fluent/Core/IContextStage.cs

@@ -14,5 +14,7 @@ public interface IContextStage<RawType, OutType> {
     IContextStage<RawType, OutType> UseFragments();
     IContextStage<RawType, OutType> UsePlaywright(PlaywrightAsyncManipulator manipulator);
     IContextStage<RawType, OutType> UseStealth(StealthAsyncManipulator manipulator, StealthConfig config);
+    IContextStage<RawType, OutType> ConfigureUnitDownloaderOptions(
+        Action<UnitDownloaderOptionsBuilder<RawType, OutType>> configure);
     DownloadEnumerable<OutType> Build();
 }