Add native ScreenCast portal with PipeWire monitor streams

packaging/portal/ferese-portals.conf

@@ -0,0 +1,3 @@
+[preferred]
+default=gtk;
+org.freedesktop.impl.portal.ScreenCast=ferese;

packaging/portal/ferese.portal

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+[portal]
+DBusName=org.freedesktop.impl.portal.desktop.ferese
+Interfaces=org.freedesktop.impl.portal.ScreenCast;
+UseIn=Ferese;

packaging/portal/org.freedesktop.impl.portal.desktop.ferese.service

@@ -0,0 +1,3 @@
+[D-BUS Service]
+Name=org.freedesktop.impl.portal.desktop.ferese
+Exec=/usr/local/lib/ferese/current/xdg-desktop-portal-ferese