bors 7200da0217 Auto merge of #93873 - Stovent:big-ints, r=m-ou-se
Reimplement `carrying_add` and `borrowing_sub` for signed integers.

As per the discussion in #85532, this PR reimplements `carrying_add` and `borrowing_sub` for signed integers.

It also adds unit tests for both unsigned and signed integers, emphasing on the behaviours of the methods.
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