Add unused prival pubKey back to node info

[LCyson]

Describe your changes and provide context

TM 0.35 removes unused pubKey from node.rpcEnv and only validator nodes will return validator_info in the/status tm rpc endpoint. This update, however, breaks many auxiliary packages' interface as they cannot correctly serialize the default validator_info.address:

TM 0.34:

...
"validator_info":{
    "address":"E7996BE5125FBF866A3136F15072F2DAB31094FD",
    "pub_key":{
        "type":"tendermint/PubKeyEd25519",
        "value":"AC4vhXhevEYEFktkNQib6prIoSh6YDeZp7yn0kEqO1o="
    },
    "voting_power":"0"
}

TM 0.35:

...
"validator_info":{
    "address":"",
    "pub_key":null,
    "voting_power":"0"
}

=> ERROR failed to spawn chain runtime: relayer error: RPC error to endpoint http://:26657/: serde parse error: expected 40-character hex string, got "" at line 1 column 1298

This PR reverts the change and add back the unused pubKey & address of any node type.

Note that the other option to fix the interface incompatibility is to add a default dummy address (a 40 character hex string), but that may be confusing for any future reader / relevant issue or error.

Testing performed to validate your change

• e2e test with IBC on sei-devnet-3
• unit tests