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

[Björn Schäpers via cfe-commits]

https://github.com/HazardyKnusperkeks commented:

I think it should be merges with `BinPackArguments` to get an enum
* Never
* TwentyOrAbove (name is debatable)
* Always
* (Leave?)

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