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/ManyAnchorsDataProvider.cs

@@ -0,0 +1,20 @@
+using Beam.Abstractions;
+using HtmlAgilityPack;
+
+namespace Beam.Dynamic;
+
+public class ManyAnchorsDataProvider : AnchorDataProvider, IManySelectionComposableDataProvider<string[]> {
+    public new string[] Get(HtmlDocument document) {
+        return [base.Get(document)];
+    }
+    public string[] ManyGet(HtmlNode[] node) {
+        return node.Select(x => base.Get(x)).ToArray();
+    }
+    public HtmlNode[]? SelectMany(HtmlDocument doc) {
+        var k = Select(doc);
+        return k == null ? null : [k];
+    }
+    public HtmlNode[]? SelectMany(HtmlNode[] node) {
+        return node.Select(x => Select(x) ?? null).Where(x => x is not null).Cast<HtmlNode>().ToArray();
+    }
+}