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

[Daan De Meyer via cfe-commits]

DaanDeMeyer wrote:

@mydeveloperday I'm sorry but I'm not sure I follow your suggestion. Are you suggesting `Leave` as another option aside from `Left` and `Right`?

Something like this?

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

Though I would argue `Leave` is a separate feature from overriding the pointer alignment for specific scenarios.

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