[clang] [clang-format] add BinPackLongBracedLists style option (PR #112482)

[Gedare Bloom via cfe-commits]

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@@ -1208,6 +1208,21 @@ struct FormatStyle {
   /// \version 3.7
   bool BinPackArguments;
 
+  /// If ``BinPackArguments`` is ``false`` this option can override it if
+  /// ``true`` when 20 or more items are in a braced initializer list.
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gedare wrote:

I rewrote it similar to your suggestion.

https://github.com/llvm/llvm-project/pull/112482