Add DirDiff utility and enhance package build process

- Introduced DirDiff class for tracking directory file changes.
- Updated ConsoleApplication to use addCommand for build targets.
- Enhanced PackageBuilder with methods for deploying binaries and extracting debug info.
- Improved package installation logic to support shared extensions.
- Added readline extension with patching for static builds.

src/StaticPHP/Package/PhpExtensionPackage.php

@@ -107,4 +107,9 @@ class PhpExtensionPackage extends Package
     {
         return $this->build_with_php;
     }
+
+    public function buildSharedExtension(): void
+    {
+        // TODO: build common shared extensions code here...
+    }
 }