cleanup: replace old nacl functions with libsodium replacements #3030

Follow up to #2497 , we still use functions libsodium only includes for NaCl api-compatibilty.

eg. crypto_box

https://doc.libsodium.org/doc/public-key_cryptography/authenticated_encryption#notes

Notes
The original NaCl crypto_box API is also supported, albeit not recommended.
crypto_box() takes a pointer to 32 bytes before the message and stores the ciphertext 16 bytes after the destination pointer, with the first 16 bytes being overwritten with zeros. crypto_box_open() takes a pointer to 16 bytes before the ciphertext and stores the message 32 bytes after the destination pointer, overwriting the first 32 bytes with zeros.
The _easy and _detached APIs are faster and improve usability by not requiring padding, copying, or tricky pointer arithmetic.

• refactor(crypto): replace crypto_box_afternm with crypto_box_easy_afternm #3080

Might be more.