Move to more capable python3-zstandard compression library

[tasket]

This would address issues such as:

1. Buffer grind: Wyng must constantly create&destroy buffers used for compression, slowing down data processing operations such as send
2. No access to dictionary functions, which enhance compression ratio and speed
3. Not able to seek withing a zstandard stream, which could be quite useful for new Wyng features

Blocking:
Qubes 4.1 dom0 is based on Fedora 32 which lacks this library - Qubes 4.2 is close to release