[clang] [clang-format] Allow custom pointer/ref alignment in return types (PR #169160)

[Daan De Meyer via cfe-commits]

DaanDeMeyer wrote:

> I just think if we are introducing a struct mechanism for the option it should follow the previous struct pattern not make up a new one (Irrespective of if you feel its better, I think that subjective)... I'm still struggling with why we need this and not do it like we have with the BraceOption etc in the past. I'm a no to this design, but if @HazardyKnusperkeks and @owenca both agree its ok then I'll yield, but I'm not comfortable with it like this but I won't block them.

I am happy to rework it to the following:

```
PointerAlignment: Custom
CustomPointerAlignment:
  Default: Right
  CStyleCast: Left
  ReturnType: Left
```

But we still need `Default` in that setup to specify the default alignment to use.

An alternative is

```
PointerAlignment: Right
PointerAlignmentOverride:
  CStyleCast: Left
  ReturnType: Left
```

Would that be acceptable?



https://github.com/llvm/llvm-project/pull/169160