[libcxx-commits] [libcxx] [libc++] Add `ranges::fold_left_first` and `ranges::fold_left_first_with_iter` (PR #121558)

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JCGoran wrote:

After a long hiatus, I'd like to work on this again. I've resolved the merge conflicts with main and removed unrelated changes. What else needs to be done?

@Zingam if I am reading the [docs](https://docs.github.com/en/issues/tracking-your-work-with-issues/using-issues/adding-sub-issues) right, I do not have sufficient permissions to do this.

https://github.com/llvm/llvm-project/pull/121558