[clang] [clang-format] Change BinPackParameters to an enum to add a BreakAlways (PR #101882)

[Owen Pan via cfe-commits]

owenca wrote:

> > Whilst I can understand BinPackParameters being deprecated, as its one of the original options I do worry a little about just how much impact such a deprecation might have... it needs to be completely seemless because there is ALOT of documentation references to its use on say stackoverflow. etc...
> > One reason I suggested making the change without renaming the option was the level of flux the name change was having.
> 
> I had never reviewed a similar PR (until #96804) let alone having worked on one. Now I understand it's better to keep the option name even if it's confusing.

Actually, we renamed boolean options before when extending them to `enum`s, e.g. [`AlwaysBreakTemplateDeclarations`](https://clang.llvm.org/docs/ClangFormatStyleOptions.html#alwaysbreaktemplatedeclarations). So I guess it depends on whether or not the old name would be confusing enough.

https://github.com/llvm/llvm-project/pull/101882