Optionally, package as Windows app for the Microsoft Store

This adds support for packaging a project with the AppxPackager for publication in the Microsoft Store.

Additionally, only build artifacts matching *.appx, *.appxupload, *.exe, *.7z, *.sha256 are copied (as done on binary factory).

An example of a .craft.ini for Kate, that enables packaging as Microsoft app, looks like this:

[BlueprintSettings]
kde/applications/kate.packageAppx = True

Example run of the job: https://invent.kde.org/utilities/kate/-/jobs/555428 (still running)