More animeted webp test images added

ImageSharp.sln

@@ -372,6 +372,9 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Webp", "Webp", "{983A31E2-5
 		tests\Images\Input\WebP\alpha_filter_3_method_1.webp = tests\Images\Input\WebP\alpha_filter_3_method_1.webp
 		tests\Images\Input\WebP\alpha_no_compression.webp = tests\Images\Input\WebP\alpha_no_compression.webp
 		tests\Images\Input\WebP\animated-webp.webp = tests\Images\Input\WebP\animated-webp.webp
+		tests\Images\Input\WebP\animated2.webp = tests\Images\Input\WebP\animated2.webp
+		tests\Images\Input\WebP\animated3.webp = tests\Images\Input\WebP\animated3.webp
+		tests\Images\Input\WebP\animated_lossy.webp = tests\Images\Input\WebP\animated_lossy.webp
 		tests\Images\Input\WebP\bad_palette_index.webp = tests\Images\Input\WebP\bad_palette_index.webp
 		tests\Images\Input\WebP\big_endian_bug_393.webp = tests\Images\Input\WebP\big_endian_bug_393.webp
 		tests\Images\Input\WebP\bryce.webp = tests\Images\Input\WebP\bryce.webp

tests/ImageSharp.Tests/TestImages.cs

@@ -371,6 +371,9 @@ namespace SixLabors.ImageSharp.Tests
             public static class Animated
             {
                 public const string Animated1 = "WebP/animated-webp.webp";
+                public const string Animated2 = "WebP/animated2.webp";
+                public const string Animated3 = "WebP/animated3.webp";
+                public const string Animated4 = "WebP/animated_lossy.webp";
             }
 
             public static class Lossless