Node: New setLogEventListeners() utility to get log events

[ibc]

Details

• Instead of relying on DEBUG variable and stdout/stderr logs, an application may want to collect mediasoup generated logs and post them somewhere.
• This PR exposes a new setLogEventListeners() function at mediasoup root module level.

Usage example

mediasoup.setLogEventListeners({
  ondebug: undefined,
  onwarn: (namespace: string, log: string) => {
    MyEnterpriseLogger.warn(`${namespace} ${log}`);
  },
  onerror: (namespace: string, log: string, error?: Error) => {
    if (error) {
      MyEnterpriseLogger.error(`${namespace} ${log}: ${error}`);
    } else {
      MyEnterpriseLogger.error(`${namespace} ${log}`);
    }
  }
});

Notes

• This change forces us (the developers) to always call logger.debug() with a single string argument, same for logger.warn(), and call logger.error() with one string argument or also with a second and optional Error argument.
• Personally I like this since this forced me to change some existing logs and use a consistent syntax in all them.