Introduce text::Alignment with Justified support

wgpu/src/layer.rs

@@ -103,8 +103,8 @@ impl Layer {
             line_height: text.line_height.to_absolute(text.size)
                 * transformation.scale_factor(),
             font: text.font,
-            horizontal_alignment: text.horizontal_alignment,
-            vertical_alignment: text.vertical_alignment,
+            align_x: text.align_x,
+            align_y: text.align_y,
             shaping: text.shaping,
             clip_bounds: clip_bounds * transformation,
         };