Auto merge of #79607 - DrMeepster:maybe_uninit_write_slice, r=m-ou-se
MaybeUninit::copy/clone_from_slice This PR adds 2 new methods to MaybeUninit under the feature of `maybe_uninit_write_slice`: `copy_from_slice` and `clone_from_slice`. These are useful for initializing uninitialized buffers (such as the one returned by `Vec::spare_capacity_mut` for example) with initialized data. The methods behave similarly to the methods on slices, but the destination is uninitialized and they return the destination slice as an initialized slice.
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