introduce ActionEndpointInfo from action graph.

[fujitatomoya]

Description

Part of ros2/ros2cli#1210

Fixes # (issue)

Is this user-facing behavior change?

No, new methods and APIs to support ActionEndpointInfo

Did you use Generative AI?

Yes, Claude Fable

Additional Information

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Pull request overview

Adds a new action-graph API to rclcpp_action which exposes aggregated endpoint information (goal/cancel/result services + feedback/status topics) via the new ActionEndpointInfo type, plus new graph query/count functions and accompanying tests.

Changes:

• Introduce rclcpp_action::ActionEndpointInfo and public graph query functions in include/rclcpp_action/graph.hpp.
• Implement graph queries/counting backed by rcl_action graph APIs in rclcpp_action/src/graph.cpp.
• Add test_graph coverage and wire the new source/test into rclcpp_action’s CMake build.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
rclcpp_action/test/test_graph.cpp	Adds unit tests for the new action graph info and counting APIs.
rclcpp_action/src/graph.cpp	Implements conversion and retrieval logic for action client/server endpoint info and counts.
rclcpp_action/include/rclcpp_action/rclcpp_action.hpp	Exposes the new graph API via the umbrella header.
rclcpp_action/include/rclcpp_action/graph.hpp	Declares the new ActionEndpointInfo API and graph query/count functions.
rclcpp_action/CMakeLists.txt	Builds/installs the new implementation file and adds the new gtest target.

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