zstd compression support in mariadb server protocol

The server protocol does not seem to support zstd compression on the wire , it only supports zlib for compression. Other servers support zstd for a long time.

I can see the releavant flag is supported in the mariadb client.

zsd runs x3 to 10x faster for similar or better compression. It should so be something the server proctol should support

To avoid confusion, this is about compression on the wire protocol; not about comrpession of db files (e.g. innodb) on the file system.