Rollup merge of #71082 - NeoRaider:ptr_slice_len, r=oli-obk,SimonSapin

ptr: introduce len() method on raw slices

It is already possible to extract the pointer part of a raw slice by a
simple cast, but retrieving the length is not possible without relying
on the representation of the raw slice when it is not valid to convert
the raw slice into a slice reference (i.e. the pointer is null or
unaligned).

~Introduce a new function ptr::slice_len() to add this missing feature.~

Introduce a len() method on raw slices to add this missing feature.

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