[clang] [clang-format] Add an option to control indentation of `export { ... }` (PR #110381)

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Sirraide wrote:

> @Sirraide hi are you still working on this? We observed similar issue recently. #121723

Ah yeah, I was planning to get back to that last week but then I got sick; I should have time to look at it again sometime later this week.

https://github.com/llvm/llvm-project/pull/110381