libcore: add `str::first`, `str::split_first`, `str::last` and `str::split_last` methods#89603

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eduardosm:str-first-last

Commits on Nov 24, 2021

libcore: add `str::first`, `str::split_first`, `str::last` and `str::split_last` methods
eduardosm
committed
libcore: add `_char` suffix to `str::(split_)?(first|last)` functions
eduardosm
committed