feat(ui): add child anchor and content sizing to column layout

include/Cubed/ui/column_layout.hpp

@@ -1,6 +1,9 @@
 #pragma once
 #include "Cubed/ui/widget.hpp"
 namespace Cubed {
+
+enum class ColumnLayoutAnchor { LEFT, CENTER, RIGHT };
+
 class ColumnLayout : public Widget {
 public:
     ColumnLayout(const ColumnLayout&) = delete;
@@ -18,10 +21,13 @@ public:
     ColumnLayout& set_spacing(int spacing);
     // No need for parent node pointer; do not modify children's anchors and
     // scale.
-
+    ColumnLayout& set_child_anchor(ColumnLayoutAnchor anchor);
     void layout();
 
 private:
     int m_spacing = 0;
+    float m_content_height = 0;
+    float m_content_width = 0;
+    ColumnLayoutAnchor m_layout_anchor = ColumnLayoutAnchor::CENTER;
 };
 } // namespace Cubed