Add override control scripts

[ilyakooo0]

Add the following control scripts:

1. default deployment overrides
2. keys for deployment overrides
3. default application overrides – should take final deployment overrides as one of the arguments
4. key for app overrides – should take final deployment overrides as one of the arguments

The output should be read from stdout in the CSV format.

The default arguments should be displayed to the user in the web UI. The user can then choose to edit or delete existing overrides or add new overrides. The structure for the override edits was introduced in #68 although not fully integrated (they are currently used as the old override system).

We should only store the edits the user made. To get the full config we would run the "default overrides" script again and apply the saved user edits on top.

The keys should just be passed to the frontend and used as suggestions to the user.