feat(preferences): Added support for iOS suites

[micbis]

This is needed i.e. to share data with a notification service extension.

Replacing the former PR #1966

[JohanBeumer]

@micbis I was trying to use your changes, but ran into a problem. Maybe a merge did not go well?
When I comment the lines below in PreferencesPlugin.swift it works for me.

I am not a reviewer, just an enthusiastic user who loves to see your changes merged.

        if group == nil, let suite = suite {
            configuration = PreferencesConfiguration(for: suite)
        } else {
            if let group = group, let suite = suite {
                if group == "NativeStorage" {
                    configuration = PreferencesConfiguration(for: suite, for: .cordovaNativeStorage)
                } else {
                    configuration = PreferencesConfiguration(for: suite, for: .named(group))
                }
            } else {
                // configuration = PreferencesConfiguration(for: .named(group))
                configuration = PreferencesConfiguration()
            }
        } // else {
//            configuration = PreferencesConfiguration()
//        }

[micbis]

@JohanBeumer Thanks, looks like. Will fix that asap.