RobotWebTools / rclnodejs / 14726825758

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Add some missing methods from rcl (#1106)

This PR adds missing methods to count publishers, subscriptions, clients, and services in rclnodejs, along with corresponding tests and binding implementations.  
- New tests have been implemented to verify the newly added methods.  
- Binding functions in C++ for subscriptions, publishers, nodes, and contexts have been extended.

| File                                | Description                                          |
| ----------------------------------- | ---------------------------------------------------- |
| test/test-subscription.js           | Added test to verify publisher count on a subscription. |
| test/test-publisher.js              | Added test to verify subscription count on a publisher. |
| test/test-node.js                   | Added tests for counting clients and services on a node.  |
| test/test-context.js                | Added test to verify the context's domain ID.        |
| src/rcl_subscription_bindings.cpp   | Added GetPublisherCount binding.                     |
| src/rcl_publisher_bindings.cpp      | Added GetSubscriptionCount binding.                  |
| src/rcl_node_bindings.cpp           | Added countPublishers, countSubscribers, countClients, and countServices bindings. |
| src/rcl_graph_bindings.cpp          | Removed redundant count functions.                   |
| src/rcl_context_bindings.cpp        | Added GetDomainId binding.                           |
| lib/subscription.js                 | Added publisherCount getter.                         |
| lib/publisher.js                    | Added subscriptionCount getter.                      |
| lib/node.js                        | Added countClients and countServices methods.        |
| lib/context.js                      | Added domainId getter.                               |

Fix: #1107

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