Config API: Add hash of settings to the state

There are a lot of important settings that will cause super big problems if they are different between nodes.

The long term plan is to move these settings into the state. But this is a tricky thing to do, and is not something we will get to in the short term.

A much simpler solution would be to write the hash of these important settings to the state. That way, if nodes have different configurations, they will quickly be detected (as an ISS).

There are many settings we would not want to include in the hash (i.e. node local settings).