Add run Utility

[J-Marte]

This pull requests adds the run utility, which consists of three parts:

Run Utility: The flutter application handles the searching and displaying of the search results. Gnome Extension: The Gnome Extension will handle the things which the App can not handle such as: summoning, positioning and force window focus Settings: The integration into the existing setting flutter application

Other changes: Fixed build: the linux/flutter/ephemeral/ should not be version tracked by git, because there are in the .gitignore file.

Related issues: #7