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.Dynamic/DataProviders/RelationalDataProvider.cs

@@ -0,0 +1,32 @@
+using Beam.Abstractions;
+using HtmlAgilityPack;
+
+namespace Beam.Dynamic;
+
+public enum RelationType {
+    Parent,
+    Child,
+}
+
+public class RelationalDataProvider : IComposableDataProvider<HtmlNode?> {
+    
+    public RelationType RelationType { get; set; } = RelationType.Parent;
+    public IBinding? Content { get; set; }
+    
+    public HtmlNode? Get(HtmlDocument document) {
+        return Select(document);
+    }
+    public HtmlNode? Get(HtmlNode node) {
+        return Select(node);
+    }
+    public HtmlNode? Select(HtmlDocument doc) {
+        return Select(Content?.Select(doc) ?? doc.DocumentNode);
+    }
+    public HtmlNode? Select(HtmlNode node) {
+        return RelationType switch {
+            RelationType.Parent => node.ParentNode,
+            RelationType.Child => node.FirstChild,
+            _ => throw new NotSupportedException()
+        };
+    }
+}