RobotWebTools / rclnodejs / 20162533939

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Add MessageIntrospector for message schema inspection (#1346)

MessageIntrospector, a utility class that provides a simplified API for inspecting ROS 2 message structure without directly using loader.loadInterface.

- typeName: Returns the full message type (e.g., geometry_msgs/msg/Twist)
- fields:- Returns an array of top-level field names
- defaults: Returns a deep copy of the message's default values
- schema: Returns the underlying ROSMessageDef object
- typeClass: Returns the underlying constructor

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