Staking Bech/Naming Updates

based on earlier conversations today (CC @jaekwon, @cwgoes, @ValarDragon) - within staking validator object:
 - `Operator` -> `OperatorAddr`
 - `PubKey` -> `ConsPubKey`

Within the bech prefixes we should rename:
 - `cosmoscons` -> `cosmosvalcons`
 - `cosmosval` -> `cosmosvaloper`

Or something along those lines - feel free to edit if this has a mistake

(CC @alexanderbez)