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Auto merge of #117619 - elomatreb:add-duration-abs-diff, r=thomcc
Add `Duration::abs_diff`
This adds a `Duration::abs_diff` method analogous to the existing one on the primitive integers.
ACP: https://github.com/rust-lang/libs-team/issues/291
Tracking Issue: https://github.com/rust-lang/rust/issues/117618
