config: Move consensus configuration into a seperate config file

[ValarDragon]

Most of the things in the config are local configuration parameters, which a full node operator can tune. However consensus parameters are not something the node operator should just set, they are a property of the chain. I think we should move these into a separate file from config.toml as we don't want most node operators changing these.

[ebuchman]

Hmm not sure if these should be considered subjective params or not. Things that shouldn't be tweaked go in the genesis file. Technically these consensus config options can be changed without issue by operators however they want, though there could be some liveness issues if the timeouts diverge too much. @milosevic thoughts?

[tac0turtle]

closing this in favor of #2920