[runcommand] Add windows support

Summary:
Added windows support to the runcommand plugin
Completes T10001

Test Plan:

1. Run a command
2. Run the command

Reviewers: KDE Connect, nicolasfella, albertvaka

Reviewed By: KDE Connect, albertvaka

Subscribers: albertvaka, shivanshukantprasad, apol, nicolasfella, kdeconnect, KDE Connect

Tags: KDE Connect, Windows

Differential Revision: https://phabricator.kde.org/D16746