feat: Adding Folder selector feature

[Fufu-btw]

Summary

Adds Folder Selector to the Adaptix Client

Features

Create a folder selector create_selector_folder with the same behaviour as create_selector_file, to get the base64+zip content for a local folder. This can be used to transfer some folder recursivly between the AdaptixClient & AdaptixServer.

Design

• Use Qt6 CorePrivate with qzipwriter_p to zip a folder
• Object create_selector_folder is available for .axs scripts
• Same behaviour and structure as AxSelectorFile

Test Plan

• Build AdaptixServer

[RalfHacker]

dev-1.3 not supported, use testing-v2.0