Consider enabling the unsafe_op_in_unsafe_fn lint

[Jan561]

This lint forces the user to use unsafe blocks even inside unasfe functions.

This lint makes it easier for maintainers to spot the operations that are causing unsafety, and provide an opportunity for contributors to explain why this operation is safe, given the additional guarantees the caller has to uphold.

This lint is currently allowed by default, but this will change in edition 2024.

References:

• Lint docs: https://doc.rust-lang.org/rustc/lints/listing/allowed-by-default.html#unsafe-op-in-unsafe-fn
• Beta lint docs: https://doc.rust-lang.org/beta/nightly-rustc/rustc_lint/builtin/static.UNSAFE_OP_IN_UNSAFE_FN.html
• RFC: https://github.com/rust-lang/rfcs/blob/master/text/2585-unsafe-block-in-unsafe-fn.md
• Tracking Issue: Tracking Issue for "unsafe blocks in unsafe fn" (RFC #2585) rust-lang/rust#71668

[SteveLauC]

Seems to be a reasonable change to me