fix: unaligned read for Metal buffers

[Oppen]

fix: unaligned read on Metal implementation

After Rust 1.77 u128 starts requiring 16 bytes aligned values. This
breaks Metal, where retrieve_contents assumed it could just cast the
pointer and treat it as a slice.
Instead, we need to assume no alignment by doing the following:

1. Read the i-th element from the buffer with
   ptr.add(i).read_unaligned();
2. clone the read value, as the bitwise copy may cause aliasing
   otherwise;
3. push the cloned value into the vector;
4. mem::forget the element we read to avoid calling its drop
   implementation twice, one for the copy and one for the Buffer.

Type of change

• Bug fix

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.03%. Comparing base (2a68c19) to head (16746a9).
Report is 12 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #882   +/-   ##
=======================================
  Coverage   72.03%   72.03%           
=======================================
  Files         149      149           
  Lines       33407    33407           
=======================================
  Hits        24066    24066           
  Misses       9341     9341           

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