chore(prot): remove validator key book [AC-1568]

• Closes AC-1568
• Removes the validator key books
• Simplifies the BVN operator key books (one page w/ remote auth vs two pages w/ delegated auth)
• Moves special network account handling logic out of transaction executors into internal/block/network_accounts.go
• Eliminates validator transactions
• Updates Tendermint validator set via global values instead of via special transactions
• Updates dn/network to store keys instead of key hashes
• Updates genesis and node initialization to allow global values to be overridden at genesis

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Related to AC-1568