RobotWebTools / rclnodejs / 19565048871

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feat: add ParameterWatcher for real time parameter monitoring (#1326)

Implement ParameterWatcher class to enable real-time monitoring of parameter changes on remote nodes. Subscribes to /parameter_events topic and emits 'change' events when watched parameters are modified.

Features:
- Watch specific parameters on remote nodes
- Real-time change notifications via EventEmitter
- Dynamic parameter list management (add/remove)
- Async/await support with timeout and AbortSignal
- Proper lifecycle management and cleanup

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