Work on generators for settings apps for firebase deploy

[mainawycliffe]

At the moment, the firebase generator is focused on functions, which makes sense. Still, we want to be able to do something like nx g @nx-toolkit/firebase:hosting app-name, and we would use the info available to update the firebase config for hosting for that project. The trick part is going to handle that on the firebase side.

Maybe some inspiration can be got from the angular counterpart that does the same -> https://github.com/angular/angularfire/blob/master/docs/deploy/getting-started.md