kaidokert / fixed-bigint-rs / 28344348125

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Add Zeroize/ZeroizeOnDrop/Drop for BytesHolder (#124)

* Add `Zeroize`/`ZeroizeOnDrop`/`Drop` for `BytesHolder`

Implements `zeroize::Zeroize`, `zeroize::ZeroizeOnDrop`, and a wiping
`Drop` for `BytesHolder<T, N>` under `feature = "zeroize"`. The wipe
goes through the byte view so the guarantee covers the actual memory
representation rather than per-word `T::zeroize`.

This satisfies the `T::Bytes: zeroize::Zeroize` bound that downstream
crypto code (rsa_heapless `uint_to_zeroizing_be_pad_into` paths) needs
to wipe the intermediate `to_be_bytes()`/`to_le_bytes()` buffer after
copying it into the output slice.

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