Add WireGuard capability.

Summary:
FEATURE: 397572
FIXED-IN: 5.14.0

Reviewers: #plasma, jgrulich, pino

Reviewed By: jgrulich

Subscribers: acrouthamel, K900, pino, lbeltrame, ngraham, plasma-devel

Tags: #plasma

Differential Revision: https://phabricator.kde.org/D15093