Auto merge of #74373 - lcnr:array_chunks, r=withoutboats

add `slice::array_chunks` to std

Now that #74113 has landed, these methods are suddenly usable. A rebirth of #72334

Tests are directly copied from `chunks_exact` and some additional tests for type inference.

r? @withoutboats as you are both part of t-libs and working on const generics. closes #60735

diff --cc library/alloc/src/lib.rs
Simple merge