Add support for staking commands

[fadeev]

Cosmos EVM has staking precompiles to facilitate interactions with the staking Cosmos SDK modules from EVM realm.

Data querying should be done through the staking precompile.

All parameters should be passed as flags like so --first-name alice to be consistent with the rest of the CLI.

For transaction broadcasting support accounts both from zetachain accounts as well as passing --private-key.