Feature request: NaCl (SealedBox, Box, SecretBox)

**Is your feature request related to a problem? Please describe.**
It will be really useful thing, because now a lot of websites and apps are using this encryption(like SealedBox, Box, SecretBox)

**Describe the solution you'd like**
This website do what i want: https://8gwifi.org/naclsealboxenc.jsp, it implements SealedBox. But in python exists really good lib, that implements all features of NaCl https://pynacl.readthedocs.io/en/latest/

**Describe alternatives you've considered**

**Additional context**

The issue names no CyberChef files, tests, or entry points. Start by reviewing the project's existing operation structure and the linked PyNaCl documentation, then define the scope for SealedBox, Box, and SecretBox. Done requires agreed implementations and verification criteria, which the issue does not specify.

Written by the indexing model from the issue text.