feat(lidar_centerpoint): add diagnostics for processing time

[a-maumau]

Description

This PR adds diagnostics for processing time.

If the processing time exceeds max_allowed_processing_time, a warning topic will be published.
If this exceeds the threshold consecutively for more than max_consecutive_warn_count times, an error diagnostics topic will be published.

Related links

Parent Issue:

• Link

How was this PR tested?

Tested by checking the rqt_runtime_monitor.

Run rqt_runtime_monitor by

# optional
# ros2 run autoware_diagnostic_graph_utils converter_node

ros2 run rqt_runtime_monitor rqt_runtime_monitor

(above image was created in sample-rosbag with very small max_allowed_processing_time for demonstration)

Notes for reviewers

None.

Interface changes

None.

Effects on system behavior

None.

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