Change sync snap operations for async operations ( Remove, Install, List, Find )

[JeffLabonte]

Just to make sure that everything works fine with the front-end later, We'll have to change sync functions in snap service.

Otherwise it might block the front-end.

[lah7]

Python's threading could come into play. That's how the current "prototype 2.0" software-boutique currently prevents Python code from blocking WebView.

[JeffLabonte]

There is method that handles it in the Glib. I have used the sync method for now to get stuff going and work only on the install and remove logic. I will change the sync method for the async one.

Doc on install_async