Agent.network(): Unknown operation 'network' in system message request

It appears that the Agent.network() function defined [here](https://github.com/corellium/corellium-api/blob/master/src/agent.js#L909) doesn't work.

Upon calling it an error is thrown:
`InvalidArgument: Unknown operation 'network' in system message request`

It occurs with this test script
```javascript
import {Corellium} from "@corellium/corellium-api";

async function main() {
let corellium = new Corellium({
endpoint: "https://app.corellium.com",
apiToken: process.env["CORELLIUM_API_KEY"]
});

await corellium.login();

let project = await corellium.projectNamed("Default Project");
let instance = await project.getInstance(process.env["CORELLIUM_DEVICE_ID"]);
const agent = await instance.newAgent();
await agent.ready();

let network = await agent.network();
console.log(network);

agent.disconnect();
}

main().catch((err) => {
console.error(err);
});
```

Start at src/agent.js around line 909 and reproduce the failure with the test script in the issue. Determine why Agent.network() produces the unknown-operation error, then verify that the call completes and returns network information without throwing.

Written by the indexing model from the issue text.