Feature request: zstd compression support

**Is your feature request related to a problem? Please describe.**
I find that zstd compression algorithm would be a nice addition to the current list of algorithms in cyberchef.

**Describe the solution you'd like**
I think this project can do zstd compress/decompress of Uint8Array through js: https://github.com/yoshihitoh/zstd-codec

**Describe alternatives you've considered**
use zstd binary cli for the operation

Review CyberChef’s existing compression operations, then read the zstd-codec API linked in the issue and how it handles Uint8Array values. Add zstd compression and decompression as available operations, and confirm both directions work with representative binary input.

Written by the indexing model from the issue text.