image loop benchmark

tests/benchmark_image_loop.nim

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+import benchy, pixie
+
+let image = newImage(2560, 1440)
+image.fill(rgba(50, 100, 150, 200))
+
+timeIt "x then y":
+  var sum: uint64
+  for x in 0 ..< image.width:
+    for y in 0 ..< image.height:
+      let pixel = image.getRgbaUnsafe(x, y)
+      sum += pixel.r + pixel.g + pixel.b + pixel.a
+  if sum == 0:
+    echo "0"
+  keep sum
+
+timeIt "y then x":
+  var sum: uint64
+  for y in 0 ..< image.height:
+    for x in 0 ..< image.width:
+      let pixel = image.getRgbaUnsafe(x, y)
+      sum += pixel.r + pixel.g + pixel.b + pixel.a
+  if sum == 0:
+    echo "0"
+  keep sum