screencasting: Adoption of the org_kde_plasma_video_streaming protocol
Summary:
Instead of creating the pipewire feeds in the portal, they will be
created in KWin.
Then the portal task becomes to orchestrate the permission and delivery
to the app.
Depends on D28882
Test Plan: None yet, just a PoC
Reviewers: jgrulich
Reviewed By: jgrulich
Subscribers: davidedmundson, jgrulich, plasma-devel
Tags: Plasma
Differential Revision: https://phabricator.kde.org/D28884