Function addProgramListener

addProgramListener(arg, listenerFn): Promise<void>
Add a program listener to get program updates including widgets published from produce suite
Parameters
- arg: {
  programId: string;
  }
  - programId: string
- listenerFn: ProgramListenerCallback
Returns Promise<void>
Since
0.1.0

Example
```
function programListener({event, message}){
   // your custom logic
}
addProgramListener({
 programId: "<Your program Id>"
}, programListener)
```

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