bors 156da98b29 Auto merge of #112818 - Benjamin-L:add-slice_split_once, r=cuviper
Implement `slice::split_once` and `slice::rsplit_once`

Feature gate is `slice_split_once` and tracking issue is #112811. These are equivalents to the existing `str::split_once` and `str::rsplit_once` methods.
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