Make ros2 action info --verbose consistent with topic/service info

[catplotlib]

Description

Adds a --verbose / -v option to ros2 action info, matching the output style already provided by ros2 topic info -v and ros2 service info -v.

Default output is unchanged. With --verbose, each action client / server is printed as a block containing:

• Node name
• Node namespace
• Action type
• Endpoint type (CLIENT / SERVER)

QoS and type hash are intentionally omitted since they are not exposed for action endpoints (per the linked issue).
Addresses the second TODO in #1210.

Is this user-facing behavior change?

Yes. ros2 action info now accepts --verbose / -v. Previously this flag was rejected as an unknown argument.

Example (new behavior):

$ ros2 action info -v /fibonacci
Action: /fibonacci
Action clients: 0
Action servers: 1

Node name: fibonacci_action_server
Node namespace: /
Action type: test_msgs/action/Fibonacci
Endpoint type: SERVER

Without -v, output is identical to before.

Did you use Generative AI?

Yes — Claude Opus 4.7

Additional Information

• Added two CLI tests in ros2action/test/test_cli.py:
  • test_fibonacci_info_verbose — asserts the verbose block fields
  • test_fibonacci_info_verbose_count — asserts -v -c suppresses the per-endpoint block
• No changes to the default (non-verbose) output, so existing users / scripts are unaffected.
• --verbose combined with --count prints only the counts, matching the behavior of ros2 topic info -v -c.

[catplotlib]

@fujitatomoya can i get a review on this please?