feat: Implement loop control structures (@foreach, @endforeach)

[benkhalife]

Description

To handle arrays and collection rendering elegantly, we need to introduce loop directives. Adding support for @foreach will significantly reduce boilerplate code when rendering dynamic lists or tables in Webrium View.

Proposed Syntax

<ul>
    @foreach($items as $item)
        <li>{{ $item->name }}</li>
    @endforeach
</ul>

Expected Behavior

The template engine should compile @foreach($a as $b) into and @Endforeach into .

Checklist

• Implement parser for @foreach(...) mapping to native PHP loops.
• Implement parser for @Endforeach.
• Handle nested loops correctly without breaking the scope.
• Add unit tests for looping through various data structures (arrays, objects).