feat(diagnostic_graph_aggregator): add dump tool

[isamu-takagi]

Description

Add dump tool for diagnostic_graph_aggregator.

Tests performed

1. Run this command
   ros2 launch diagnostic_graph_aggregator example.launch.xml
2. Run this command in another terminal
   ros2 run diagnostic_graph_aggregator dump
3. Check that you see output like below

   | ----- | ----- | -------------------------------- | ----- |
   | index | level | name                             | links |
   | ----- | ----- | -------------------------------- | ----- |
   | 0     | OK    | /sensing/radars/front            |       |
   | 1     | OK    | /sensing/lidars/front            |       |
   | 2     | ERROR | /sensing/lidars/top              |       |
   | 3     | OK    | /functions/obstacle_detection    | 1 0   |
   | 4     | ERROR | /functions/pose_estimation       | 2     |
   | 5     | OK    | /external/remote_command         |       |
   | 6     | OK    | /external/joystick_command       |       |
   | 7     | ERROR | /autoware/modes/pull_over        | 4 3   |
   | 8     | OK    | /autoware/modes/comfortable_stop | 3     |
   | 9     | OK    | /autoware/modes/emergency_stop   |       |
   | 10    | OK    | /autoware/modes/remote           | 5     |
   | 11    | OK    | /autoware/modes/local            | 6     |
   | 12    | ERROR | /autoware/modes/autonomous       | 4 3   |
   | 13    | OK    | /autoware/modes/stop             |       |
   

Effects on system behavior

Not applicable.

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[mkuri]

LGTM

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (c9e6dda) 14.99% compared to head (d69d46e) 15.00%.
Report is 47 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6427   +/-   ##
=======================================
  Coverage   14.99%   15.00%           
=======================================
  Files        1838     1838           
  Lines      127099   127074   -25     
  Branches    38075    38065   -10     
=======================================
  Hits        19062    19062           
+ Misses      86715    86690   -25     
  Partials    21322    21322           

Flag	Coverage Δ		*Carryforward flag
differential	39.71% <ø> (?)
total	15.00% <ø> (+<0.01%)	⬆️	Carriedforward from c9e6dda

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