canvas: Respect FillRule (#38294)

We just need to pass user provided FillRule via IPC to canvas paint
thread, then pass it all down to backend, which will handle it.

Testing: Added WPT tests.

---------

Signed-off-by: sagudev <16504129+sagudev@users.noreply.github.com>

components/canvas/peniko_conversions.rs

@@ -207,3 +207,12 @@ impl Convert<peniko::ImageQuality> for Filter {
         }
     }
 }
+
+impl Convert<peniko::Fill> for FillRule {
+    fn convert(self) -> peniko::Fill {
+        match self {
+            FillRule::Nonzero => peniko::Fill::NonZero,
+            FillRule::Evenodd => peniko::Fill::EvenOdd,
+        }
+    }
+}