Reduce allocations in MakeArrayFormatter (#52675)

JsonEncodedText is a struct. Passing it into StringBuilder.Append will box the value into an object, just to call ToString() on it.

Instead, grab the Value string from the JsonEncodedText and pass the string into StringBuilder.Append, so nothing is boxed.

Author: eerhardt

src/Components/Components/src/BindConverter.cs

@@ -1810,13 +1810,13 @@ private static class FormatterDelegateCache
                 }
 
                 var builder = new StringBuilder("[\"");
-                builder.Append(JsonEncodedText.Encode(elementFormatter(value[0], culture)?.ToString() ?? string.Empty));
+                builder.Append(JsonEncodedText.Encode(elementFormatter(value[0], culture)?.ToString() ?? string.Empty).Value);
                 builder.Append('\"');
 
                 for (var i = 1; i < value.Length; i++)
                 {
                     builder.Append(", \"");
-                    builder.Append(JsonEncodedText.Encode(elementFormatter(value[i], culture)?.ToString() ?? string.Empty));
+                    builder.Append(JsonEncodedText.Encode(elementFormatter(value[i], culture)?.ToString() ?? string.Empty).Value);
                     builder.Append('\"');
                 }