Add option to always open Nautilus in expanded view

[capt-nemo429]

From Discord:

Feature request, I'd like a toggle in settings for Nautilus to always open in expanded view.

[arobsn]

Implementation details

• Both Tab and Popup views must be called programmatically. Thus manifest's default_popup property must be removed.

• The service worker must listen to the onClicked event, and once fired it needs to look at the local storage, using the sync API, and then open the selected view.

• Popup opening: It looks like from Chrome 99, you can use chrome.action.openPopup() in combination with chrome.action.setPopup({ popup: "popup/index.html" }) to programmatically open it. Firefox compatibility should be investigated. This StackOverflow question has a lot of useful info: https://stackoverflow.com/questions/5544256/how-to-programmatically-open-a-chrome-extension-popup-window-from-background-htm

• Tab opening: should be as simples as calling chrome.runtime.getURL("popup/index.html")

Remarks

1. Popup view must be the default action
2. It must have a "switcher" for opt-in/out in the settings page