use MemoryExtenions.SequenceEqual for better performance (neo-project…

…#3578)

Co-authored-by: Christopher Schuchardt <cschuchardt88@gmail.com>

src/Neo.Cryptography.BLS12_381/Fp.cs

@@ -9,6 +9,7 @@
 // Redistribution and use in source and binary forms with or without
 // modifications are permitted.
 
+using Neo.Extensions;
 using System.Buffers.Binary;
 using System.Diagnostics.CodeAnalysis;
 using System.Runtime.CompilerServices;
@@ -152,11 +153,7 @@ public bool TryWrite(Span<byte> buffer)
 
         public override string ToString()
         {
-            var output = string.Empty;
-            foreach (var b in ToArray())
-                output += b.ToString("x2");
-
-            return "0x" + output;
+            return "0x" + ToArray().ToHexString();
         }
 
         public bool LexicographicallyLargest()

src/Neo.Extensions/ByteArrayEqualityComparer.cs

@@ -11,7 +11,6 @@
 
 using System;
 using System.Collections.Generic;
-using System.Linq;
 
 namespace Neo.Extensions
 {
@@ -24,7 +23,7 @@ public bool Equals(byte[]? x, byte[]? y)
             if (ReferenceEquals(x, y)) return true;
             if (x is null || y is null || x.Length != y.Length) return false;
 
-            return x.SequenceEqual(y);
+            return x.AsSpan().SequenceEqual(y.AsSpan());
         }
 
         public int GetHashCode(byte[] obj)