add the max wasm contract size to the output of the config subcommand

[artemijspavlovs]

Is your feature request related to a problem? Please describe.
I would like to be able to get the current value of MaxWasmSize as one of the fields in the output of rollappd config

Describe the solution you'd like
the output could be:

$ rollappd config
{
        "chain-id": "rollappwasm_1234-2",
        "keyring-backend": "test",
        "output": "text",
        "node": "tcp://localhost:26657",
        "broadcast-mode": "sync",
        "max-wasm-size": "2560000"
}