[clang] [clang-format]: Split alignment of declarations around assignment (PR #69340)

[Gedare Bloom via cfe-commits]

gedare wrote:

> See [#66857 (comment)](https://github.com/llvm/llvm-project/issues/66857#issuecomment-1793022188). Can you make this a suboption, e.g. `AlignFunctionPointers`? We can add another (e.g. `AlignConstructorsDestructors`) for ctors and dtors in the future.

Yes, I will work on this.

https://github.com/llvm/llvm-project/pull/69340