Borrowck Scarifices exposes uninitialized memory in any_as_u8_slice

The safe function `any_as_u8_slice` can create byte slices that reference uninitialized memory when used with types containing padding bytes.

The function uses `slice::from_raw_parts` to create a `&[u8]` covering the entire size of a type, including padding bytes. According to Rust's documentation, `from_raw_parts` requires all bytes to be properly initialized, but padding bytes in structs are not guaranteed to be initialized. This violates the safety contract and causes undefined behavior.