Add fax4 image for benchmarks

tests/ImageSharp.Benchmarks/Codecs/Tiff/DecodeTiff.cs

@@ -46,6 +46,7 @@ namespace SixLabors.ImageSharp.Benchmarks.Codecs
 
         [Params(
             TestImages.Tiff.CcittFax3AllTermCodes,
+            TestImages.Tiff.Fax4Compressed2,
             TestImages.Tiff.HuffmanRleAllMakeupCodes,
             TestImages.Tiff.Calliphora_GrayscaleUncompressed,
             TestImages.Tiff.Calliphora_RgbPaletteLzw_Predictor,

tests/ImageSharp.Tests/TestImages.cs

@@ -759,6 +759,7 @@ namespace SixLabors.ImageSharp.Tests
             public const string Calliphora_HuffmanCompressed = "Tiff/Calliphora_huffman_rle.tiff";
             public const string Calliphora_BiColorUncompressed = "Tiff/Calliphora_bicolor_uncompressed.tiff";
             public const string Fax4Compressed = "Tiff/basi3p02_fax4.tiff";
+            public const string Fax4Compressed2 = "Tiff/CCITTGroup4.tiff";
             public const string Fax4CompressedLowerOrderBitsFirst = "Tiff/basi3p02_fax4_lowerOrderBitsFirst.tiff";
 
             public const string CcittFax3AllTermCodes = "Tiff/ccitt_fax3_all_terminating_codes.tiff";

tests/Images/Input/Tiff/CCITTGroup4.tiff

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:120ad0814f207c45d968b05f7435034ecfee8ac1a0958cd984a070dad31f66f3
+size 11082