[clang] [clang-format] Add option to omit wrapping for empty records (PR #151970)

[Tomáš Slanina via cfe-commits]

itzexpoexpo wrote:

My patch targets *empty* records specifically, an `AllowShortRecordOnASingleLine` option equivalent to the existing ones would probably format my example as:
```
  struct foo { int i; };
  struct bar {};
```
I feel it's functionally closer to the `SplitEmpty...` options instead.

https://github.com/llvm/llvm-project/pull/151970