To add on to @wjwwood
`ParameterService` allows other nodes to set/get/list parameters in this node.
`ParameterClient` provides API to set/get/list parameters on other nodes.
Neither of these are the API for interacting with the parameters for this node, which should be done through `Node`.
A caveat on `Node::register_param_change_callback()`, you can only register one callback per node (currently), if you register multiple times, only the last one will be called.
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