Add way to enable IsShakeEnabled without LogController instance

[jfversluis]

Does it make sense to somehow enable the shake to show the logs without having to instantiate the LogController? Maybe together with the navigation setup it can be a builder.ConfigureMetroLog() call in the generic host builder?

Maybe I should use it in a more real-world scenario but implementing a simple sample it seemed like if I quickly want to enable this functionality without some kind of settings page it doesn't seem to make much sense to create an instance and just set that property.

Do you have any thoughts on that? Was it done like this on purpose?

[roubachof]

Use LogController static methods ResumeShakeIfNeeded and SuspendShake