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

[Björn Schäpers via cfe-commits]

HazardyKnusperkeks wrote:

> > I think it should be merges with `BinPackArguments` to get an enum
> > 
> > * Never
> > * TwentyOrAbove (name is debatable)
> > * Always
> > * (Leave?)
> 
> Currently the 20 item limit is only enforced on C++ initializer lists. Making it part of the `BinPackArguments` means it has to apply to any bin packing situation, so the scope of the style option increases. I'm not convinced it is worth doing.

Fair enough.

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