Use bsl::memcpy to fix strict aliasing errors

[ahsanabbas123]

Problem statement

While building with vcpkg on linux x86_64, we get errors due to strict aliasing not being complied with - as mentioned in microsoft/vcpkg#34797.

error: dereferencing type-punned pointer will break strict-aliasing rules [-Werror=strict-aliasing]
  379 |             *reinterpret_cast<const bsl::uint64_t*>(&val); 

Proposed changes

We use bsl::memcpy instead.