feat: Add Bun language analyzer and related functionality

- Implemented BunPackageNormalizer to deduplicate packages by name and version.
- Created BunProjectDiscoverer to identify Bun project roots in the filesystem.
- Added project files for the Bun analyzer including manifest and project configuration.
- Developed comprehensive tests for Bun language analyzer covering various scenarios.
- Included fixture files for testing standard installs, isolated linker installs, lockfile-only scenarios, and workspaces.
- Established stubs for authentication sessions to facilitate testing in the web application.

src/Scanner/__Libraries/StellaOps.Scanner.Analyzers.Lang.Bun/BunAnalyzerPlugin.cs

@@ -0,0 +1,20 @@
+using System;
+using StellaOps.Scanner.Analyzers.Lang.Plugin;
+
+namespace StellaOps.Scanner.Analyzers.Lang.Bun;
+
+/// <summary>
+/// Restart-time plugin that exposes the Bun language analyzer.
+/// </summary>
+public sealed class BunAnalyzerPlugin : ILanguageAnalyzerPlugin
+{
+    public string Name => "StellaOps.Scanner.Analyzers.Lang.Bun";
+
+    public bool IsAvailable(IServiceProvider services) => services is not null;
+
+    public ILanguageAnalyzer CreateAnalyzer(IServiceProvider services)
+    {
+        ArgumentNullException.ThrowIfNull(services);
+        return new BunLanguageAnalyzer();
+    }
+}